Valentinian I
Socrates of Constantinople wrote in the 5th century that the Roman Emperor Valentinian I took two wives and authorized his subjects to take two wives, supporting that Christians were then practicing plural marriage. There is no trace of such an edict in any of the extant Roman Laws. Valentinian I divorced his first wife according to John Malalas, the Chronicon Paschale and John of Nikiu, before marrying his mistress, which was viewed as bigamy by Socrates, since the Church did not accept divorce.