The Duchy of Normandy, part of the Angevin Empire until the 13th century, developed its own version of Gothic. One of these was the Norman chevet, a small apse or chapel attached to the choir at the east end of the church, which typically had a half-dome. The lantern tower was another common feature in Norman Gothic. One example of early Norman Gothic is Bayeux Cathedral (1060–70) where the Romanesque cathedral nave and choir were rebuilt into the Gothic style. Lisieux Cathedral was begun in 1170. Rouen Cathedral (begun 1185) was rebuilt from Romanesque to Gothic with distinct Norman features, including a lantern tower, deeply moulded decoration, and high pointed arcades. Coutances Cathedral was remade into Gothic beginning about 1220. Its most distinctive feature is the octagonal lantern on the crossing of the transept, decorated with ornamental ribs, and surrounded by sixteen bays and sixteen lancet windows.