Mythology comes from folk memory from the distant past.One such myth/memory is of Moses and his followers crossing the Red sea as it opened up,and seeing a "pillar of fire" There is a school of thought which says that what he/they saw was the eruption of Thera (Santorini) one of the largest volcanic event ever to hit Europe.But it is seen ,or was seen, as a myth but now seems to be a folk memory. So someone, who was with Moses and his followers, actually saw the event of this vast eruption and wrote it down.
keenonhist