Sorry to do an "actually" here but funnily enough history is not historically written records. History as a branch of knowledge was specifically operated upon the context that the likelihood of something happening historically is based on the individual's effort to ascertain the word of mouth of the people to find certainty and consistency. That is because what is written can easily be done by anyone but convincing many people over generations would be much harder. So the fact that history has shifted to what is written as the authority is actually a successful implementation of an attack vector to manipulate truth.
tl;dr Historically oral history was the only form of discovering what is true and specifically regarded as more rigorous than written accounts.
At least, when taking history into account.
Etymology is also interesting:
> From Middle English historie, from Old French estoire, estorie (“chronicle, history, story”) (French histoire), from Latin historia, from Ancient Greek ἱστορίᾱ (historíā, “learning through research”), from ἱστορέω (historéō, “to research, inquire (and) record”), from ἵστωρ (hístōr, “the knowing, wise one”), from Proto-Indo-European *weyd- (“see, know”). Doublet of story and storey.
Fascinating that history is based on "seeing and knowing."