William I was the second Latin archbishop of Tyre from 1128 until 1134 or 1135. He was originally from England and served as prior of the Church of the Holy Sepulchre before his appointment as archbishop. In Rome, William was successful in both missions. Honorius ordered all the bishops of the province of Tyre to obey the archbishop and confirmed that the entire province lay within the patriarchate of Jerusalem. He and Roger were also successful in their secular mission, helping arrange the marriage of Melisende, heiress of Jerusalem, to Count Fulk V of Anjou.