There were no books in ancient times. Knowledge was passed down from memory. There were papyri but obviously few of those survived. We know building mind palac

There were no books in ancient times. Knowledge was passed down from memory. There were papyri but obviously few of those survived. We know building mind palaces/the loci method was part of the curriculum in Greece and Rome. And thus conceivably likely of most peoples of that time that had a complex culture lasting hundreds or thousands of years. That's why knowledge about hallucinogen use in those times is scarce. You may find chemical evidence. We know of hallucinogen use everywhere in ancient times mainly because of this. See e.g. [1]. But inscriptions of details of rituals in e.g. stone are pretty non-existent. Most likely hallucinogen use was simply too 'everyday' to warrant such treatment. "And after the pharaoh crushed his enemies he munged on a magic mushroom." was probably just as mundane as "And after the allies won WW2, all the commanders sat down together and had a beer." [1] https://web.archive.org/web/20140821182342/http://www.hallofmaat.com/modules.php?name=Articles&file=article&sid=45 https://web.archive.org/web/20140821182342/http://www.hallof...