[4] In 1219, Honorius III appointed him a papal judge delegate alongside Archbishops Berard of Palermo and Carus of Monreale in a case involving the church of Santa Maria dell'Ammiraglio.
[10] In 1220, he was again appointed a judge delegate, this time alongside the abbot of Santo Spirito, in a lawsuit between the church of San Cataldo and the cathedral of Palermo.
[11] Aldoin visited Emperor Frederick II in Germany and Honorius III in Viterbo sometime between October 1219 and June 1220.
[12] It is probably in connection with his visit to Frederick that he was recognized as a familiaris domini regis ('one of the lord king's household'), a title attested in April–May 1220.
Aldoin objected at the time to various exactions made by Archbishop Berard and Count Alamanno da Costa on behalf of the crown and for the support of the Fifth Crusade.
In March, he met Frederick II at Ferentino and agreed to an investigation of the charges against Aldoin after the bishop was restored.
[19] His trial, contrary to the pope's instructions, had begun in the interim under the abbot of Santo Spirito, acting as delegate for the appointed judge, Archbishop Luke of Cosenza [it].
[20] He made "extravagant claims to damages" incurred during Frederick's absence in Germany in 1216–1220 and demanded compensation for the costs of his trips to Rome.
[23] To a mistress named Rose, who lived in Cefalù, he was said to have given tithes; to one in Palermo, grain, wine, meat and silk that belonged to the church.
[21] No judgement was issued, first, because Aldoin accepted the appointment of a coadjutor, Thomas, canon of Messina, and, second, because Honorius ruled that the archbishop lacked the authority to re-delegate his responsibility once his first delegate had been dismissed, thereby nullifying the proceedings.
[14] In May 1225, Honorius charged Aldoin with excommunicating the monks of Santissimo Salvatore in Lingua Phari [it] and ordering a new election for the archimandritate.
In July 1227, acting on behalf of the vacant archdiocese of Messina, he consecrated the church of the Holy Trinity in Geraci.
He was certainly exiled by April 1235, when Frederick, at a Hoftag in Fano, declared his presence in the kingdom intolerable on account of his disloyalty.