Norwich also records the site of an Anglo-Saxon church in Tombland, the site of the Saxon market place and the later Norman cathedral. Norwich continued to be a major centre for trade, the River Wensum being a convenient export route to the River Yare and Great Yarmouth, which served as the port for Norwich. Quern stones and other artefacts from Scandinavia and the Rhineland have been found during excavations in Norwich city centre. These date from the 11th century onwards. Norwich Castle was founded soon after the Norman Conquest. The Domesday Book records that 98 Saxon homes were demolished to make
Norwich Union's office. Other notable buildings that were lost were three theatres, Norwich Hippodrome on St Giles Street, which is now a multi-storey car park, The Grosvenor Rooms and the Electric Theatre of Prince of Wales Road, The Corn Hall on Exchange Street, the Free Library on Duke Street and the Great Eastern Hotel, that stood facing Norwich Station. In 1976 the city's pioneering spirit was on show when Motum Road in Norwich, allegedly the scene of "a number of accidents over the years", became the third road in Britain to be equipped with sleeping policemen, intended to encourage adherence to