 On 11 August 1198, Pope Innocent asked the Archbishop of Cagliari, Bishop of Sorres, and the Pisan Bandino, Archbishop-Elect of Torres, to investigate the foundation of the accusations against Giusto.Giusto claimed that Arborea was a fief of the Holy See and that the canons of Oristano had no power to grant the judgeship to William, who had ousted Peter and imprisoned him.The pope put the whole investigation under the guidance and oversight of the clergy of the island.