Hidden Gaps In History We Still Don’t Understand
Every claim, checked
No claims match the selected verdicts.
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Claim 1
A mysterious atmospheric haze beginning in 536 CE dimmed the sun for about 18 months.
Contemporary accounts describe an unusually dim sun beginning in 536, and climate researchers report that the dust veil persisted for roughly 18 months.
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Claim 2
Temperatures fell by about 2.5 degrees Celsius across the Northern Hemisphere, crops failed globally, livestock died, and summer snow fell in China.
Reconstructions indicate Northern Hemisphere summer cooling of approximately 1.5–2.5°C, and historical records report crop failures and summer snow in China. However, evidence does not establish simultaneous global crop failure or universal livestock deaths.
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Claim 3
Historians call 536 CE the worst year in human history to be alive.
The description originated prominently with historian Michael McCormick and became a popular headline, but it is not a formal or universal judgment held by historians collectively.
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Claim 4
Procopius wrote that the sun gave off no more light than the moon.
Procopius wrote that the sun gave forth light without brightness, like the moon, during the period. The transcript is a close paraphrase rather than a precise quotation.
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Claim 5
Ice cores from Greenland and Antarctica contain volcanic ash and sulfur from the 536 event, although the source volcano remains disputed.
Ice cores provide strong volcanic-sulfate evidence, and volcanic glass associated with 536 has been found in Greenland; Antarctic evidence is weaker and sometimes cannot resolve the closely spaced 536 and 540 eruptions. No source volcano has been identified with certainty.
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Claim 6
The Plague of Justinian began in 541 CE and kicked off about 150 years of cooling called the Late Antique Little Ice Age.
The first pandemic outbreak conventionally associated with the Plague of Justinian began in 541 CE, but the Late Antique Little Ice Age is generally dated from 536 to about 660—roughly 125 years—and is attributed primarily to successive volcanic eruptions rather than the plague.
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Claim 7
Roopkund is a Himalayan lake at roughly 16,000 feet containing the remains of hundreds of people.
Roopkund lies at approximately 5,029 meters, or 16,500 feet, and several hundred human remains are scattered in and around the lake.
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Claim 8
The outside world first learned of Roopkund's skeletons when a British ranger found them in 1942.
A forest ranger, Hari Kishan Madhwal, reported or rediscovered the remains in 1942, bringing them to official attention. Calling him simply a 'British ranger' is misleading because he was an Indian ranger working under British colonial administration, and local people may already have known of the site.
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Claim 9
About 500 Roopkund skeletons all have the same fatal blunt-force wound on top of the skull, caused by falling objects.
Only some examined skulls were reported to have rounded injuries that inspired the hailstorm theory; there is no evidence that roughly 500 people all had an identical wound or shared one established cause of death. Genetic and radiocarbon evidence also shows that the remains accumulated in multiple events.
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Claim 10
The best explanation for all the Roopkund deaths is a freak storm producing cricket-ball-sized hailstones.
A severe hailstorm was proposed for at least some of the earlier remains, but it remains an unproven hypothesis and cannot explain all the skeletons, which represent genetically distinct groups deposited centuries apart.
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Claim 11
DNA and radiocarbon testing found distinct Roopkund groups: people with South Asian ancestry from around 800 CE and people with eastern Mediterranean ancestry from around 1800 CE.
A 2019 genome-wide study found South Asian-related individuals dating to around 800 CE and a later group with eastern Mediterranean-related ancestry dating to around 1800 CE; it also identified one Southeast Asian-related individual in the later period.
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Claim 12
The separate Roopkund groups died from exactly the same cause about a thousand years apart.
The study established different ancestry groups and deposition periods but did not determine a common cause of death. The varied dates of the earlier individuals specifically undermine the claim that everyone died in one repeated type of catastrophe.
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Claim 13
Around 1200 BCE, the Mycenaean and Hittite systems collapsed within decades, while Egypt nearly collapsed, in what is called the Bronze Age collapse.
Major palace-based societies across the eastern Mediterranean disintegrated over the late 13th and early 12th centuries BCE; the Hittite Empire and Mycenaean palace system fell, while Egypt survived after severe conflict and disruption.
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Claim 14
The cause of the Bronze Age collapse remains uncertain, with proposed factors including earthquakes, drought, the Sea Peoples, and disease.
There is no single agreed cause; scholarship discusses interacting pressures including climatic drought, earthquakes, migration or attacks associated with groups called the Sea Peoples, internal disruption, trade breakdown, and possibly disease.
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Claim 15
The best explanation for the Late Bronze Age collapse is a catastrophic supply-chain failure in which interconnected civilizations pulled one another down.
Trade disruption and systemic interdependence are important scholarly explanations, but no single cause is accepted as the definitive “best theory.” Most accounts describe a multicausal collapse involving drought, famine, conflict, migration, political instability, and disrupted trade over decades.
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Claim 16
After the Late Bronze Age collapse, writing disappeared in some regions for centuries and major cities were abandoned.
Linear B writing ceased in Greece, not returning there in a new alphabetic form until centuries later, while numerous Mycenaean towns and palatial centers were destroyed, abandoned, or substantially reduced.
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Claim 17
The population of Greece dropped by an estimated 75% during the Late Bronze Age collapse.
Population loss was severe, but a major modern demographic study estimates an aggregate decline of roughly 40–60% between the late 13th and late 11th centuries BCE, not 75%. Exact figures remain uncertain because they are reconstructed from archaeological evidence.
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Claim 18
Humanity went from complex international trade networks to small villages and forgot how to write practically overnight.
The collapse was regional rather than a change affecting all humanity, and writing continued in places such as Egypt and parts of the Near East. In Greece, the transformation unfolded over decades and involved smaller agricultural communities and the loss of Linear B, not an overnight event.
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Claim 19
More than 100 Roman dodecahedra have been found across Europe, and no known Roman writing or image explains or depicts them.
More than 100 examples are documented, mainly in northwestern parts of the former Roman Empire. No accepted ancient textual reference or unambiguous contemporary depiction has been identified, leaving their function unknown.
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Claim 20
Roman dodecahedra are hollow bronze or copper-alloy objects with 12 pentagonal faces and differently sized circular openings, ranging roughly from golf-ball to grapefruit size.
Known specimens are hollow copper-alloy dodecahedra with pentagonal faces and apertures of varying diameters. Their documented overall sizes are approximately 4–11 centimeters, broadly matching that comparison, although individual specimens vary.
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Claim 21
Roman dodecahedra were found mostly in cold northern provinces and were frequently buried with coins as treasure, indicating that their owners regarded them as deeply valuable.
They are concentrated in the empire's northwestern provinces, and several have been recovered from coin hoards. However, examples also come from graves and refuse deposits, so “frequently buried with coins” and the conclusion that all were deeply valuable overstate the evidence.
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Claim 22
The Copper Scroll was discovered by archaeologists near the Dead Sea in 1952 and was made of copper rather than parchment.
Archaeologists excavating Qumran Cave 3 in 1952 found the unusual two-part Copper Scroll. Unlike the parchment and papyrus manuscripts normally associated with the Dead Sea Scrolls, its text was inscribed on copper-alloy sheets.
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Claim 23
The Copper Scroll lists 64 locations where large quantities of gold and silver were hidden.
The text is conventionally divided into 64 entries or hiding-place descriptions, most referring to caches of gold, silver, coins, vessels, or other valuables. Whether the treasure was real remains disputed.
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Claim 24
The Copper Scroll describes an estimated 65 tons of precious metal worth well over $1 billion at today's prices.
Translations and conversions of the ancient units are highly uncertain, and published totals vary dramatically; one estimate gives 26 tons of gold plus 65 tons of silver, while another gives a total range of 58–174 tons. Consequently, presenting 65 tons and a precise modern valuation as settled figures is unwarranted.
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Claim 25
Some scholars believe the Copper Scroll records Jerusalem Temple treasure hidden before the Romans destroyed Jerusalem in 70 CE.
Temple treasure concealed before the Roman destruction is a longstanding scholarly hypothesis. It is not established fact, however; other proposals connect the treasure to Qumran, undelivered Temple contributions, or the Bar Kokhba revolt.
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Claim 26
Japan has over 160,000 ancient burial mounds known as kofun.
UNESCO and Japan's Tourism Agency both state that more than 160,000 kofun have been identified across Japan.
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Claim 27
Daisen Kofun is larger in total area than the Great Pyramid of Giza and has a giant keyhole shape surrounded by water.
Daisenryo is a roughly 486-meter-long keyhole-shaped mound enclosed by moats; its overall footprint is substantially larger than the Great Pyramid's base, although the pyramid is far taller and has greater structural volume.
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Claim 28
Kofun tombs were built between about 300 and 700 AD, during the period when Japan was developing into a centralized state.
Authoritative sources date kofun construction broadly from the third through seventh centuries and describe the period as preceding and contributing to the establishment of Japan's centralized state.
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Claim 29
The Japanese government entirely refuses to let anyone excavate the imperial kofun, and the Imperial Household Agency controls all access.
The Imperial Household Agency severely restricts access to designated imperial tombs, but the prohibition is not absolute: scholars have received limited inspections, and a joint excavation began at Daisen Kofun in 2018. Moreover, the agency does not control all of Japan's 160,000 kofun, only those designated as imperial sites.
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Claim 30
The stated reason for restricting excavation of imperial tombs is respect for the dead because they are regarded as resting places of imperial ancestors.
The agency treats these sites as active graves of imperial ancestors and has justified restrictions as protecting their serenity, dignity and security.
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Claim 31
Scholars have suggested that excavation could reveal Korean or Chinese connections that complicate claims of a purely native, unbroken imperial lineage.
Researchers and news reports have explicitly discussed the possibility that the tombs contain evidence of significant Korean or Chinese influence or ancestry. This is a documented scholarly hypothesis, not a demonstrated explanation for the agency's restrictions.
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Claim 32
Silphium was worth its weight in silver and grew only along a small coastal region of ancient Cyrenaica in modern Libya.
Pliny reported that silphium resin sold at the same rate as silver, while ancient and modern studies identify its restricted source as Cyrenaica in present-day Libya.
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Claim 33
Attempts to cultivate silphium elsewhere always failed because it could not grow in any other soil.
Ancient accounts describe silphium as difficult or impossible to cultivate and restricted to Cyrenaica, but there is insufficient evidence to establish that every attempt elsewhere failed specifically because of the soil.
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Claim 34
Romans used silphium as both a common seasoning and a medicine for ailments including stomach problems, coughs, fevers and sore throats.
Ancient medical and culinary texts describe silphium as both a spice and a treatment prescribed for fever and numerous respiratory and digestive complaints, though that does not establish its medical effectiveness.
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Claim 35
Julius Caesar personally stored 1,500 pounds of silphium in the Roman treasury.
Pliny says Caesar produced or withdrew 1,500 Roman pounds of laserpicium from the public treasury at the start of the civil war. That supports the quantity and location but not the implication that Caesar personally placed or maintained a private stock there.
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Claim 36
Ancient writers documented silphium becoming progressively rarer before its extinction.
Ancient accounts describe declining availability, and Pliny reported that the plant could no longer be found except for a single reported specimen in his era.
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Claim 37
In the first century AD, the last known stalk of silphium was picked and sent to Emperor Nero, after which the plant was extinct forever.
Pliny reported that a single stalk found in his lifetime was sent to Nero, and silphium is generally believed to have disappeared around then. Calling it definitively the last stalk and asserting permanent extinction treats an ancient anecdote and a still-debated botanical identification as certainty.
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Claim 38
We do not even know silphium's biological family, and ancient coins show it with a thick root and yellow flowers.
Its exact species remains uncertain, but botanical analyses consistently place it in the parsley family, Apiaceae/Umbelliferae, probably near Ferula. Coins depict stylized plant structures but cannot establish that its flowers were yellow.
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Claim 39
Humans eradicated silphium simply by harvesting and eating too much of it.
Overharvesting and overgrazing are leading explanations, but scholarship also considers habitat loss, environmental change and climate factors. Describing culinary consumption as the sole established cause greatly oversimplifies an uncertain extinction process.
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Claim 40
Around 2300 BC, Sargon of Akkad created the world's first true empire, stretching across much of the Middle East, with Akkad as its capital.
Sargon founded the Akkadian Empire around 2334 BCE, and it is widely described as the earliest known empire, though the precise meaning of “first true empire” and its territorial limits are debated. Akkad was its imperial capital.
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Claim 41
Despite extensive textual records, the ancient city of Akkad has never been located.
Akkad is well attested in cuneiform sources and was occupied into the second millennium BCE, but archaeologists have not securely identified its site. Statements about exactly how long or extensively archaeologists have searched are less firmly documented.
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Claim 42
Researchers suspect Akkad may lie under modern Baghdad or have been washed away and buried after the Tigris changed course.
Numerous proposed locations exist, generally near ancient waterways in central Mesopotamia, but the specific Baghdad and river-destruction scenarios remain speculative and are not established explanations for the city's disappearance.
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Claim 43
The Akkadian Empire collapsed around 2150 BC.
Under the commonly used Middle Chronology, the Akkadian dynasty ended around 2154 BCE, making “around 2150 BC” a standard approximate date. Ancient Near Eastern chronology remains somewhat uncertain.
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Claim 44
Around AD 985, Erik the Red named Greenland to attract settlers, and Norse colonists subsequently established farms, raised livestock, built churches and traded with Europe.
Medieval Icelandic tradition says Erik chose the favorable name to encourage settlement, and colonization began around 985–986. Archaeology confirms a farming society with livestock, churches, hunting and overseas trade.
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Claim 45
At its peak, roughly 5,000 Norse people lived in Greenland.
Estimates commonly range from roughly 2,000 to 5,000 or 6,000 inhabitants, but the archaeological record does not support a precise census. Five thousand is a plausible upper-end estimate, not an established figure.
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Claim 46
The last written record of the Greenland Norse is a description of a 1408 wedding at a local church.
The last generally accepted written record from Norse Greenland concerns a wedding held at Hvalsey Church in September 1408, later recorded in Iceland.
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Claim 47
When Europeans returned to Greenland in the 1500s, they found Norse ruins and cattle bones but no humans.
The Norse settlements had been abandoned, but Greenland was not devoid of people: Inuit communities lived there and encountered European expeditions. Europeans' systematic attempt to locate the old Norse colony is more closely associated with Hans Egede's arrival in 1721, not a definitive discovery in the 1500s of an island with “zero humans.”
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Claim 48
The leading explanation for the disappearance of Norse Greenland is that the Little Ice Age caused temperatures to plummet, thickened sea ice and made European trade routes nearly impassable.
Cooling, shorter growing seasons, changing sea ice and reduced connectivity probably contributed, but scholarship does not support a simple single-cause explanation or a sudden global temperature plunge. Current research emphasizes interacting climatic, economic, environmental and social pressures.
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Claim 49
The Greenland Norse largely refused to adopt successful Inuit survival techniques and destructively maintained a European farming lifestyle.
There is little evidence that the Norse adopted Inuit technologies such as harpoons, but they did adapt substantially by increasing marine-mammal hunting and modifying farming and clothing. Scholars regard the older narrative of stubborn refusal to adapt as too simplistic.
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Claim 50
The European walrus-ivory market collapsed, depriving Norse Greenland of its main export.
Walrus products were critically important to Greenland's European trade, and changing demand and competition from other ivory sources may have weakened the colony. However, evidence does not establish a simple, complete market collapse as the decisive cause of abandonment.
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Claim 51
Greenland's Norse population slowly migrated back to Iceland, with young people leaving elderly residents behind on abandoned farms.
Gradual emigration is one proposed possibility, but there is no documentary or archaeological evidence establishing an organized youth evacuation to Iceland or elderly people being left behind. The fate of the final settlers remains uncertain.
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Claim 52
The Sumerian King List attributes reigns of 43,200 years and 36,000 years to individual kings.
Academic translations of the Sumerian King List give En-men-lu-ana a reign of 43,200 years and assign 36,000-year reigns to Alaljar and Dumuzid. These are literary or mythic figures, not historically credible human lifespans.
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Claim 53
The Sumerian King List was written on clay tablets about 4,000 years ago and lists eight pre-flood rulers whose reigns total 241,200 years before a flood.
Surviving versions date mainly to the late third and early second millennia BCE. The best-known version gives eight legendary antediluvian rulers a combined 241,200 years and then states that a flood swept over the land.
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Claim 54
After the flood, the listed reigns steadily decline from 1,200 to 900 to 300 years and eventually reach normal human lengths.
Post-flood reigns generally become shorter over the course of the list, but not in the smooth sequence described. The text initially gives numerous reigns of hundreds or thousands of years, with values fluctuating substantially before historically plausible durations appear.
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Claim 55
The Sumerian King List was an official state record that Sumerians treated as literal history and used as the basis of political legitimacy.
Scholars do see the work as promoting an ideological model of divinely transferred kingship that could support dynastic legitimacy. However, authoritative descriptions classify it as a literary or scribal-school composition with multiple changing versions, not simply an official state record or evidence that all Sumerians accepted every legendary reign literally.
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Claim 56
No linguistics expert has been able to find a mathematical or counting-system explanation for the long reigns.
There is no universally accepted interpretation, but scholars have proposed several mathematical and numerological explanations involving Sumerian sexagesimal notation, scribal manipulation, and deliberately constructed numbers. Saying experts have been unable to 'crack the math' ignores this substantial scholarship.
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Claim 57
The flood detailed in the Sumerian King List closely matches the floods described in the Bible and the Epic of Gilgamesh.
The texts belong to related ancient Near Eastern flood traditions, but the King List does not detail a flood narrative; it only briefly says that a flood swept over before kingship resumed. Detailed parallels with Genesis occur primarily in Mesopotamian narratives such as Atrahasis, the Sumerian Flood Story, and the Epic of Gilgamesh.
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Claim 58
The cities named in the Sumerian King List were real cities.
The list names archaeologically and historically attested Mesopotamian cities including Eridu, Kish, Uruk, Ur, and Isin. That does not establish the historicity of every ruler or reign attributed to those cities.