He fought against the invading Seljuk Turks and later under Michael VII Doukas against Romanos after the latter had been disposed in 1071 after the Battle of Manzikert. Having defeated Romanos, he returned to Constantinople were he was supposedly poisoned around 1072. His successor as leader of the Frankish mercenaries was Roussel de Bailleul.
He fought against the Seljuk Turks and later under Michael VII Doukas against Romans after Romanos' defeat in 1071 following the Battle of Manzikert. After defeating Romanos, he returned to Constantinople where he is believed to have been poisoned around 1072. His successor as leader of the Frankish mercenaries was Roussel de Bailleul.