Guy married Ida (Itta, Ita or Itana),[1] daughter of Sico of Benevento. Their sons were Lambert I and Guy III.[1] In 843, he interfered in the Beneventan civil war on the side of his brother-in-law Siconulf. He acted as arbiter several times for high fees, but only Lothair's successor, the Emperor Louis II, could end the strife. In 846, he alone succeeded in driving the Saracens out of Latium after their sack of Saint Peter's Basilica in Rome.[2]