Career
Sent by Pope Leo X as papal nuncio to England (1515-1517), he also filled a similar office in Portugal and in Spain (1519), becoming acquainted with Cardinal Adrian Florent, Bishop of Tortosa, the Dutch preceptor of Charles V, and later Pope Adrian VI.
One of Pope Adrian"s first acts, after his entry into Rome, was to make Chieregati, whose learning and virtue the pope esteemed, Bishop of Teramo in the Kingdom of Naples. He then sent him to the Diet of Nuremberg, called for the autumn of 1522. In two discourses (19 November and 10 December) he urged the princes to co-operate for the expulsion of the Turks from Christian Hungary.
On the latter date he also demanded the immediate execution of the Edict of Worms, whereby Luther had been put under the ban of the empire, which formal outlawry he had hitherto escaped through the protection of Frederick of Saxony and other friendly princes.
Finally, on 3 January 1523, Chieregati read publicly two important documents, sent after him from Rome. The former contained an appeal to the Catholic piety, religious traditions, and magnanimity of the representatives of the German people, and besought the Diet to quench religious sedition and compel the submission of Luther and his adherents.
In it Pope Adrian confesses that the sins of ecclesiastics were the chief cause of the tribulations of the Church, and that in the Roman Curia itself, both head and members, popes and prelates, had been guilty of abuses. The reply of the Diet was discouraging.
The princes and representatives avoided an answer to the pope"s requests, proposed the celebration of a general council in some German city, and renewed in the earlier antipapal complaints of the Germans, the famous Centum gravamina teutonicae nationis.
Pastor adds that the failure of Chieregati was in large measure owing to the great German prelates who were by no means ready to repeat the confession of the pope.