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 named "Venta Icenorum", literally "the marketplace of the Iceni". The Roman settlement fell into disuse around 450 and the Anglo-Saxons settled on the site of the modern city between the 5th and 7th centuries, founding the towns of "Northwic" (from which Norwich gets its name), "Westwic" (at Norwich-over-the-Water) and the secondary settlement at Thorpe. According to a local rhyme, the demise of "Venta Icenorum" led to the development of Norwich: "Caistor was a city when Norwich was none, Norwich was built of Caistor stone." There are two suggested models of development for Norwich. It is possible that three separate early