Tertullian (c.160 - c.220) compared Noah's dove in the Hebrew Bible, who "announced to the world the assuagement of divine wrath, when she had been sent out of the ark and returned with the olive branch". with the Holy Spirit in baptism "bringing us the peace of God, sent out from the heavens".[18] In his 4th century Latin translation of the story of Noah, St Jerome rendered "leaf of olive" (Hebrew alay zayit) in Genesis 8:11 as "branch of olive" (Latin ramum olivae). In the 5th century, by which time a dove with an olive branch had become established as a Christian symbol of peace, St Augustine wrote in On Christian Doctrine that, "perpetual peace is indicated by the olive branch (oleae ramusculo) which the dove brought with it when it returned to the ark." However, in Jewish tradition there is no reference to an olive branch in the story of the Flood and no association of the olive leaf with peace.