 It was founded as a cathedral in 1075, when the seat of the bishop was moved from Selsey.Chichester Cathedral has fine architecture in both the Norman and the Gothic styles, and has been described by the architectural critic Ian Nairn as "the most typical English Cathedral".Despite this, Chichester has two architectural features that are unique among England's medieval cathedrals—a free-standing medieval bell tower (or campanile) and double aisles.