He was among the twelve cardinals of Clement III who gathered in the Lateran Palace to underwrite a papal letter on 4 November 1084.
It also issued a summons to the "schismatics", the followers of Gregory's successor, Urban II, enjoining them to be present in Rome on 1 November.
[3] The Annales Romani, the richest source of information on Adalbert's pontificate, states simply that he was elected by that part of the clergy and people of Rome who had sided with Clement III.
The situation eventually got so bad that he was forced to take refuge in the basilica of San Marcello al Corso under the protection of Romano and Giovanni Oddoline.
The Annales Romani and the biography of Paschal in the Liber pontificalis agree that the acceptance of the bribe and the antipope's imprisonment took place in the space of one day.
[2] Adalbert was eventually sent to the Benedictine monastery of San Lorenzo in Aversa, where he spent the rest of his life.
[2] In 1105, the pro-Imperial party elected Maginulf as Sylvester IV in opposition to Paschal, but he was no more successful than his predecessors for he too lacked imperial support.