It was to Wilfrith, too, that Sussex owed her first cathedral. AEthelwealh made him a present of Selsea, 'a place surrounded by the sea on every side save one, where an isthmus about as broad as a stone's-throw connects it with the mainland,' and there the ardent bishop founded a regular monastery, in which he himself remained for five years. On the soil were 250 serfs, whom Wilfrith at once set free. After the death of Aldhelm, the West Saxon bishop, in 709, Sussex was made a separate bishopric, with its seat at Selsea; and it was not till after the Norman Conquest that the cathedral was removed to Chichester. It may be noted that all these arrangements were in strict accordance with early English custom. The kings generally gave their bishops a seat near their own chief town, as Cuthbert had his see at Lindisfarne, close to the royal Northumbrian capital of Bamborough; so that the proximity of Selsea to Chichester made it the most natural place for a bishopstool; and, again, it was usual to make over spots in the fens or marshes to the monks, who, by draining and cultivating them, performed a useful secular work. No traces now remain of old Selsea Cathedral, its site having long been swallowed up by incursions of the sea. Baeda has the ordinary number of miracles to record in connection with the monastery. As time went on, however, the isolation of Sussex became less complete. AEthelwealh had got himself into complications with Wessex by accepting the sovereignty of the Isle of Wight and the Meonwaras about Southhampton from the hands of a Mercian conqueror. Perhaps AEthelwealh then repaired the old Roman roads which led from his own _ham_ at Chichester to Portsmouth in Wessex, and broke down the mark, so as to connect his old and his new dominions with one another. At any rate, shortly after, Caedwalla, the West Saxon, an aetheling at large on the look-out for a kingdom, attacked him suddenly with his host of thegns from this unexpected quarter, killed the King himself, and harried the South Saxons from marsh to marsh. Two South Saxons thegns expelled him for a time, and made themselves masters of the country. But afterwards, Caedwalla, becoming King of the West Saxons, recovered Sussex once more, and handed it on to his successor, Ini. Hence the South Saxons had no bishopric of their own during this period, but were included in the see of the West Saxons at Winchester.