On 6 June 1272, Pope Gregory X himself named Peter of Tarantaise to be Archbishop of Lyons, a post he held until he was appointed to be Bishop of Ostia. It is said, however, that Peter was never consecrated. He did, however, take the oath of fealty in early December, 1272, to King Philip III of France. Pope Gregory himself arrived in Lyons in mid-November, 1273, intent upon bringing as many prelates as possible to his planned ecumenical council. He met immediately with King Philip III of France. Their conversations were obviously harmonious, since Philip ceded to the Church the Comtat Venaissin, which he had inherited from his uncle Alphonse, Count of Toulouse. The Second Council of Lyons opened on 1 May 1274. The first session was held on Monday, 7 May. The principal items on the agenda were the Crusade, and the reunion of the Eastern and Western Churches.