Bishop of Winchester Saints Birinus and Agilbert. It was transferred to Winchester in AD 660. During the Middle Ages, it was one of the wealthiest English sees and its bishops have included a number of politically prominent Englishmen, notably the 9th century Saint Swithun and medieval magnates including William of Wykeham and Henry of Blois. A cathedral at Dorchester was founded in 634 by the Roman missionary Saint Birinus. It was the seat of a Bishop of the West Saxons; the episcopal see for that kingdom was moved to Winchester in 660 and so the Wessex Bishops of Dorchester were succeeded by the
Cathedral of Saint Domnius AD, is regarded as the oldest Catholic cathedral in the world that remains in use in its original structure, without near-complete renovation at a later date (though the bell tower dates from the 12th century). The structure itself, built in AD 305 as the Mausoleum of Diocletian, is the second oldest structure used by any Christian Cathedral. The cathedral was named after Saint Domnius ("Saint Dujam", or "Saint Domnius") patron saint of Split, who was a 3rd-century Bishop of Salona. Salona was a large Roman city serving as capital of the Province of Dalmatia. Today it is located near the