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 is now exported worldwide by its parent company Unilever (Unilever UK Export), putting Norwich on the map of British heritage brands. The Colman's Mustard Shop, which sells Colman's products and related gifts, was, until 2017, located in the Royal Arcade in the centre of Norwich. To the south-west of the city is the Norwich Research Park, which is set to undergo a period of investment and expansion. The NRP comprises a community of research organisations with world-leading science credentials, including the Institute of Food Research and the John Innes Centre, as well as over 30 science and technology-based businesses, the