While papal legate to Germany he gained the reputation of being rapacious and overly ambitious. Upon the death of Pope Adrian IV he sought in vain to have himself elected, and at the imposition of Pope Alexander III he seized the papal mantle and rushed out to his followers claiming to be the new pope. Anti-pope from 1159 to 1164. The Frangipani and the friends of Frederick Barbarossa secured Rome for him but popular discontent forced him to flee. Barbarossa, dreading excommunication by the lawful pope, summoned a Council at Pavia, Italy in 1160 to settle the two claims but in reality to install Octavius. The legates refused to support the anti-pope, who died soon after.