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 Over the Water area north of the river gradually became known as Norwich Over the Water. During the Tudor period, the name "Norwich Over the Water" was used in records used for the calculation of taxes and other official documents. The area continued to be known as Norwich Over the Water until the expansion of the city past Magpie Road and Bull Close Road in the nineteenth century. After that, with outlying areas becoming part of the city, Norwich Over the Water gradually became part of the city centre. In 1832, electoral reforms finally ended over 500 years of the name's official usage.