Where did the Young Earth Creationist doctrine originate?

I heard the other day that the literalist interpretation of biblical creation (A literal 7 day creation of the universe) isn't the classical historical interpretation that past Christians held. I was told that YEC was a relatively recent interpretation. Meaning, has genesis historically been interpreted as figurative/metaphorical (and to what degree if so?) by past Christians? If so, was YEC the default view? Were there "Old earth creationists" (or anyone who would be analogous to them) in the deep historic past? On a side note, when did alternative non-literal interpretations of Genesis come about? To be clear, this question is not the same as: https://christianity.stackexchange.com/questions/1420/where-does-the-belief-that-the-earth-is-relatively-young-6000-years-come-from Because I am asking about the origins of the doctrine itself, not seeking debate of the particularities of the doctrine and whether or not they are true.