"Some 1,600 years ago, ancient Romans would have worshiped the god Mithras, possibly in an altered state of consciousness, within the 'Mithraeum of Colored Marbles,' said archaeologists who found the remains of this temple in Ostia, Italy." Source: Live Science.
"... The mithraeum would have seen plenty of rituals in its heyday, including banquets, initiation ceremonies and animal sacrifices ... People who took part in the rituals 'were perhaps in a state of altered consciousness'... In the ancient world altered consciousness was often achieved through the use of psychotropic plants."
"Unlike most modern humans, the prehistoric people of Europe did not use mind-altering substances simply for their hedonistic pleasure. Researchers contend that their use was an integral part of prehistoric beliefs, and that these substances were seen to aid in communication with the spiritual world." Source: Science Daily (2014)
Comment: Modern stoners have written a lot of entertaining gibberish about the prehistoric use of psychedelic plants. Take the Stoned Ape Theory, for instance. According to "psychonauts" like the late Terence McKenna, the evolution of the human mind was kickstarted by the use of hallucinogens, but it's hard to see how this could have happened.
It's possible, I suppose, that psychedelic mushrooms and the like could have activated new receptors in the brain (or something like that), but even if these neurological changes had been permanent, would they have been passed down genetically? Even if they were, a lot of people must have been effected for the nature of the human mind itself to be altered in any meaningful way.
As far as I know, the use of hallucinogenic plants in prehistoric times was basically limited to shamans and small groups in strictly religious contexts, so it doesn't seem likely that their chemically-induced brain mutations -- if they actually occurred -- would have been passed down in sufficient numbers to alter the consciousness of an entire species.
"In the Old Norse written corpus, berserkers ... were warriors who purportedly fought in a trance-like fury, a characteristic which later gave rise to the modern English word 'berserk' ... Berserkers are attested to in numerous Old Norse sources, with their name literally rendered as 'bear-coats', along with úlfhéðnar ('wolf-coats')." Source: Wikipedia.
"...It is proposed by some authors that the northern warrior tradition originated in hunting magic. Three main animal cults appeared: the bear, the wolf, and the wild boar." The legend of the werewolf may be related to these ancient stories:
"Old Norse had the cognate varúlfur, but because of the high importance of werewolves in Norse mythology, there were alternative terms such as ulfhéðinn ('one in wolf-skin', referring still to the totemistic or cultic adoption of wolf-nature rather than the superstitious belief in actual shape-shifting). In modern Scandinavian also kveldulf ('evening-wolf'), presumably after the name of Kveldulf Bjalfason, a historical berserker of the 9th century who figures in the Icelandic sagas." (Wikipedia)
Berserkers, like Shieldmaidens, may be completely mythological. According to the National Museum of Denmark, there is little to no archaeological evidence that they ever existed. Assuming that they were real, however, and that the stories about their ultraviolent frenzies are accurate, what could account for their deranged behavior?
The Viking berserkers, we are told, went into battle in a trance-like rage and were supposed to be almost uncontrollable killing machines. Dressed in wolf and bear pelts, they would attack friend and foe alike and their homicidal madness sounds a lot like a drug-induced frenzy of some kind:
"This fury, which was called berserkergang, occurred not only in the heat of battle, but also during laborious work. Men who were thus seized performed things which otherwise seemed impossible for human power. This condition is said to have begun with shivering, chattering of the teeth, and chill in the body, and then the face swelled and changed its colour. With this was connected a great hot-headedness, which at last gave over into a great rage, under which they howled as wild animals, bit the edge of their shields, and cut down everything they met without discriminating between friend or foe. When this condition ceased, a great dulling of the mind and feebleness followed, which could last for one or several days." -- Fabing, Howard D. (1956). "On Going Berserk: A Neurochemical Inquiry. (Subscription-access only)
Note: A detailed commentary on berserkers in general and Fabing's paper can be found here.)
The legends suggest that the berserkers might have taken some kind of drug that caused these fits of berserkergang. Whatever it was, it came on with a rush of "shivering, chattering of the teeth and chill in the body," caused a spike in blood-pressure ("the face swelled and changed its color") and body temperature ("a great hot-headedness") and ended with a hangover with could last for days. No one really knows if the berserkers were high on something, but various candidates have been suggested:
"While some researchers believe the Berserkers simply worked themselves up into a self-induced hysteria before fighting, others maintain that it was sorcery, the consumption of drugs or alcohol, or even mental illness, that accounted for their behaviour. Some botanists have claimed that berserker behaviour could have been caused by the ingestion of the plant known as bog myrtle, one of the main spices in Scandinavian alcoholic beverages." Source: Ancient Origins.
The problem with the bog-myrtle theory is that the plant was commonly used to make beer back then and doesn't appear to produce this kind of dramatic effect on people. Maybe I missed something, but I couldn't find any mention of it in The Vaults of Erowid, a site which covers psychotropic plants and herbs in exhaustive detail.
Bog Myrtle (Myrica Gale) is a natural insect repellent, among other things. It was used (along with other herbs) to flavor beer in the middle ages until "hops supplanted gruit herbs for political and economic reasons." (Wikipedia). Bog Myrtle itself isn't psychedelic, as far as I can tell, but various mixtures of gruit herbs could act as euphorics and some of them had hallucinogenic or deliriant properties, so the idea that the Berserkers were stoned on some kind of herbal drink when they went into battle isn't all that outlandish.
"Helpful for enhancing lucid dreaming and astral work generally, bog myrtle was a flavoring for a type of European beer known as gruit up until the introduction of hops. The other components of gruit (1) were yarrow and wild rosemary. Some say this brew was behind the Berserkers [sic]. In northern Europe, bog myrtle and yarrow have been ingredients in fermented drinks made from grain, honey, or fruit since the Iron Age, and it is still used in Scandinavia to make a liqueur called 'snaps.'" Source: Alchemy Works.
(1) Medieval brewers used a wide variety of gruit herbs in their beer.
If the berserkers were high on something, the most likely candidate is gruit beer, but if they were that drunk it's hard to see how they could function very effectively. Some sources I've found speculate that they were tripping on the psychedelic amanita muscaria mushroom, but the psychoactive ingredient in the mushroom is muscimol, which is described as a "sedative-hypnotic," i.e., a tranquilizer -- just the opposite of what you would expect. Also, I've never heard of a psychedelic that consistently produces outbursts of violent rage. If the berserkers were taking a drug, it sounds like it was a medieval form of PCP.
Were the berserkers mentally ill? Again, it doesn't sound like it. Their furies seem to have been situation-specific, only occurring during battles or perhaps when they were working in their villages. If they were crazy they would've been prone to go berserk for no reason at all, but none of the sources I've found describe them flipping out at random. So, unless they were elite warriors who ate some plant that drove them into a homicidal rage the most plausible explanation for their reported behavior is that the berserkers are simply characters from Old Norse mythology. In other words, maybe they never actually existed.
"A chemical residue study of incense burners from ancient burials at high elevations in western China has revealed psychoactive cannabinoids. The finding provides some of the earliest evidence for the use of cannabis for its psychoactive compounds. " Source: Science Daily.
Note: "The [2500-year-old] THC-containing residues were extracted from burners from a cemetery known as Jirzankal in the remote Pamir Mountains.
"...While modern cannabis is used primarily as a recreational drug or for medical applications, cannabis may have been used rather differently in the past. The evidence from Jirzankal suggests that people were burning cannabis at rituals commemorating the dead. They buried their kin in tombs over which they created circular mounds, stone rings and striped patterns using black and white stones."
"The use of Cannabis as a mind-altering drug has been documented by archaeological finds in prehistoric societies in Eurasia and Africa. The oldest written record of cannabis usage is the Greek historian Herodotus's reference to the central Eurasian Scythians taking cannabis steam baths. His (c. 440 BCE) Histories records, 'The Scythians, as I said, take some of this hemp-seed [presumably, flowers], and, creeping under the felt coverings, throw it upon the red-hot stones; immediately it smokes, and gives out such a vapour as no Grecian vapour-bath can exceed; the Scyths, delighted, shout for joy.' Classical Greeks and Romans were using cannabis, while in the Middle East, use spread throughout the Islamic empire to North Africa. In 1545, cannabis spread to the western hemisphere where Spaniards imported it to Chile for its use as fiber. In North America, cannabis, in the form of hemp, was grown for use in rope, clothing and paper." Source: Wikipedia.
It seems kind of peculiar to use soft jazz as background music for a video about cannabis use in ancient Egypt, but never mind that.
"Cannabis plants are believed to have evolved on the steppes of Central Asia, specifically in the regions that are now Mongolia and southern Siberia ... The history of cannabis use goes back as far as 12,000 years, which places the plant among humanity's oldest cultivated crops, according to information in the book "Marihuana: The First Twelve Thousand Years" (Springer, 1980)." Source: Live Science (2014)
"Artists may have often turned to drugs at times to help them find inspiration, but it seems cannabis has also played a role in preserving precious artworks within ancient caves in India." Source: Daily Mail.
"A mixture of hemp, clay and lime plaster is responsible for preserving paintings and intricately carved scenes in the sacred Ellora Caves, which were hewn from rock 1,500 years ago."
Note: The Ellora Caves are an "uninterrupted sequence of monuments dating from AD 600 to 1000," according to the UNESCO World Heritage Site. "... these 34 monasteries and temples, extending over more than 2 km, were dug side by side in the wall of a high basalt cliff, not far from Aurangabad, in Maharashtra."
"In Hinduism, bhang(1) is associated with Lord Shiva, a popular deity who is often regarded as the religion’s supreme god. Some passages in ancient Hindu scriptures describe a plant with spiritual properties that Shiva discovered and brought down from the heavens for humans to consume. Shiva is often depicted with a chillum, or smoking pipe." Source: The Atlantic (2014).
(1) "In India, Cannabis Indica has been used for literally thousands of years in the worship of the god Shiva. Cannabis is used in an orally administered form called bhang which can be either the wet resinous leaves formed into pills of a drink made of milk, cannabis, and various spices consumed by worshipers of Shiva on festival days or by smoking the flowering buds of cannabis -- a practice generally reserved for holy men who dedicate their lives to ascetic practice and the worship of Shiva." --"Shiva, Lord of Bhang," PubMed.
"Cannabis has a long history in India, veiled in legends and religion. The earliest mention of cannabis has been found in The Vedas, or sacred Hindu texts. These writings may have been compiled as early as 2000 to 1400 B.C. According to The Vedas, cannabis was one of five sacred plants and a guardian angel lived in its leaves." Source: Psychology Today (2011).
"During the Hindu festival of Holi, people consume bhang which contains cannabis flowers. According to one description, when the amrita (elixir of life) was produced from the churning of the ocean by the devas and the asuras as described in the Samudra manthan, Shiva created cannabis from his own body to purify the elixir (whence, for cannabis, the epithet angaja or 'body-born'). Another account suggests that the cannabis plant sprang up when a drop of the elixir dropped on the ground. Thus, cannabis is used by sages due to association with elixir and Shiva." (Wikipedia)
The audio here is pretty bad, but this is an interesting documentary. There's a lot of speculation that the fumes inhaled by the oracle at Delphi could have been from burning marijuana or some other kind of psychotropic plant, and the use of psychedelic mushrooms has been suggested to explain the trances that priests were said to enter at various sites, but the whole subject of drug use in ancient religions is extremely obscure.
Marijuana was known and used in the ancient world. According to The Apples of Apollo: Pagan and Christian Mysteries of the Eucharist (footnote, p. 147), the Scythians used a kind of "cannabis steam bath" for ritual purification (Herodotus), and the ancient Hebrews might have done something similar. "The first solid evidence of the Hebrew use of cannabis was established in 1936 ... Cannabis, usually thought to be of Scythian origin, has a much earlier occurrence in Semitic languages and appears several times throughout the Old Testament."
The theory that marijuana was used by the ancient Greek oracles may sound absurd, but the idea isn't really all that outlandish. If the Scythians and Hebrews used the plant, there's no reason why the Greeks couldn't have been aware of its psychotropic properties as well. I don't have any particular evidence to support this, but the use of marijuana and other drugs may go all the way back to the Stone Age shamanic rituals which some scholars believe were the distant ancestors of all our modern religions.
"It’s called mad honey, and it has a slightly bitter taste and a reddish color. More notably, a few types of rhododendrons ... contain grayanotoxin, which can cause dramatic physiological reactions in humans and animals. Depending on how much a person consumes, reactions can range from hallucinations and a slower heartbeat to temporary paralysis and unconsciousness."
"The intoxicating effects of mad honey have been known for thousands of years. Not surprisingly, there have been many famous episodes of human inebriation caused by its consumption. Xenophon, Aristotle, Strabo, Pliny the Elder and Columella all document the results of eating this 'maddening' honey, believed to be from the pollen and nectar of Rhododendron luteum and Rhododendron ponticum. According to Xenophon, an invading Greek army was accidentally poisoned by harvesting and eating the local Asia Minor honey, but they all made a quick recovery with no fatalities. Having heard of this incident, and realizing that foreign invaders would be ignorant of the dangers of the local honey, King Mithridates later used the honey as a deliberate poison when Pompey's army attacked the Heptakometes [1] in Asia Minor in 69 BCE. The Roman soldiers became delirious and nauseated after being tricked into eating the toxic honey, at which point Mithridates's army attacked." Source: Wikipedia.
[1] "In about 65 BCE, Pompey's army was approaching Colchis. Mithridates' allies there, the Heptakometes, were described by Strabo as 'utterly savage' mountain barbarians, dwelling in tree forts and living on 'the flesh of wild animals and nuts.' The tribe was feared for attacking wayfarers - suddenly leaping down on them like leopards from their tree houses. The Heptakometes may have received specific orders from Mithridates on how to ambush the Roman army. What we do know for a fact is that they gathered up great numbers of wild honeycombs dripping with toxic honey and placed them all along Pompey's route. The Roman soldiers stopped to enjoy the sweets and immediately lost their senses. Reeling and babbling, the men collapsed with vomiting and diarrhea and lay on the ground unable to move. The Heptakometes easily wiped out about one thousand of Pompey's men." - Greek Fire, Poison Arrows, and Scorpion Bombs: Biological and Chemical Warfare in the Ancient World by Adrienne Mayor. (Source: Roman Times)
Taking mad honey sounds like a dangerous way to get loaded. According to the Drug Classroom, "[t]he core symptoms of mad honey poisoning include nausea, vomiting, salivation, headache, blurred vision, sweating, weakness, circumoral paresthesia, tongue numbing, fainting, drowsiness, drunkenness, tingling, and seizures." The toxins in the honey can also cause "1st to 3rd degree heart block, asystole, and myocardial infarction."
"A small pouch, made from three fox snouts neatly sewn together, may contain the world’s earliest archaeological evidence for the consumption of ayahuasca, a psychoactive plant preparation indigenous to peoples of the Amazon basin that produces potent hallucinations." Source: National Geographic.
"The pouch likely belonged to a shaman in what is now southwestern Bolivia around a thousand years ago, according to José Capriles, an anthropologist at Penn State University and an author of a paper published on the discovery today in the journal PNAS."
Note: An analysis of the pouch's contents "revealed traces of bufotenine [found in toad skins and mushrooms, among other things], benzoylecgonine [a cocaine metabolite] and cocaine (likely from coca leaf), dimethyltryptamine (DMT), harmine [an alkaloid found in ayahuasca], and possibly psilocin, a chemical component of psychedelic mushrooms."