(antipope Sept. 1100–Jan. 1101: d. 1102)
On the death of Antipope Clement III (8 Sept. 1100) his adherents in Rome, meeting secretly by night in St Peter's, elected, consecrated, and enthroned Theoderic, cardinal bishop of Albano (not S. Rufina, as mistakenly recorded), as his successor. Little is known about him except that he was cardinal deacon of Sta Maria in Via Lata in 1084, became one of Clement's leading supporters and served him as legate in Germany, and probably sheltered him in the Alban hills when he was driven out of Castel Sant'Angelo. As Pope Paschal II was absent from Rome in south Italy at the time, he was able to maintain his position for 105 days, but on Paschal's return attempted to make his escape to Emperor Henry IV (1056–1106), who in fact had had no hand in his elevation and was not averse from an understanding with the new pope. He was quickly arrested by Paschal's supporters, brought before him and sentenced to confinement in Holy Trinity monastery at La Cava, near Salerno, where the Normans could be relied upon to ensure his custody. There he became a monk, dying in 1102. He was buried in the community cemetery; the gravestone recording his name and the date is preserved.
LP ii. 298, 345 (Ann. Romani)Watterich ii. 89–91P. Kehr, ‘Zur Geschichte Wiberts von Ravenna (Clemens III)’, SAB(1921), 981–8C. Servatius, Paschalis II (Stuttgart, 1979), 42 f., 70–72, 339