The Diocese of Aleria (Latin Dioecesis Aleriensis) is, since 2002, a titular see of the Catholic Church. It was formerly a diocese of the Latin Church in the center of the eastern coast of the island of Corsica in the Department of Haute-Corse. The town of Aleria was subject to repeated raids by Arab fleets in the eighth and ninth centuries, and, eventually, abandoned. The bishop moved to a secure stronghold to the north. From at least the eleventh century, the diocese was a suffragan of the metropolitan archdiocese of Pisa. The diocese was suppressed by the Civil Constitution of the Clergy in 1790, and was not revived by the Concordat of 1801 between the French Consulate and the Papacy.[1][2]