 Initially the Kingdom of Naples supported Pope Clement, who chose to create a new diocese at Nardò.On 15 November 1379, the new bishop, the Sicilian Matteo de Castiello, arrived in Nardò to a decidedly mixed reception.His instructions were to make the monastery of S. Maria his cathedral and residence, and he therefore removed Abbot Guglielmo from governance over the territory of Nardò.