human history in the period before recorded events, known mainly through archaeological discoveries, study, research, etc.; history of prehistoric humans.
2.
a history of the events or incidents leading to a crisis, situation, or the like.
pre·his·to·ry (prē-hĭs'tə-rē) n.
pl.pre·his·to·ries
History of humankind in the period before recorded history.
The circumstances or developments leading up to or surrounding a situation, event, or development; background: "[He] then told me the curious prehistory of his obsessive interest in the seduction theory"(Janet Malcolm).