Battle of Siffin
A man of his name is recorded as being responsible for the pacification of Hadramawt in 632, during the Ridda Wars, but most scholars reject an identity with the Umayyad general. Husayn is first securely attested at the Battle of Siffin in 657, where he fought for the Umayyads. He is also mentioned as the leader of summer raids into Byzantine Asia Minor in 678 and 681/682.