The only surviving medieval building is the abbey, the Holy Cross Dominican Friary built in 1252. An arched tower and three sided cloister of the Abbey Church still survive. The next oldest extant building is the Cathedral of St Mary the Virgin and St. John the Baptist on John Street. The current building dates from 1730 when it was designed by the German architect Richard Cassels who was visiting to design Hazelwood House. The cathedral contains four memorials to the Pollexfen family, maternal relatives of W. B. Yeats.