Accused before Patriarch Philotheos Kokkinos and called to adhere to official Palamite orthodoxy, he continued to argue against it. Finally, in April 1368, Philotheos Kokkinos gathered a synod against Prochoros Kydones. In spite of the delicate handling he received and the delays that were employed to bring him back to his senses, he remained unshakable in his convictions, and appeared a number of times more or less openly to mock his judges. In the end, they pronounced against him in his absence — for he did not show up at the final session — a sentence of excommunication and of perpetual suspension from the priesthood. A long tome was put together on that occasion; it concludes with a decree declaring the canonization of Gregory Palamas.