before the 12th century, in the meaning defined above
History and Etymology for afore
Middle English aforen, aforn, afore, going back to Old English onforan, from onon entry 1 + foran "(from) in front, before," from fore "in front, fore entry 1" + -an, -ane "from (a place)" (going back to Germanic *-na) — more at aft entry 1