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 way for the castle. The Normans established a new focus of settlement around the Castle and the area to the west of it: this became known as the "New" or "French" borough, centred on the Normans' own market place which survives to the present day as Norwich Market. In 1096, Herbert de Losinga, Bishop of Thetford, began construction of Norwich Cathedral. The chief building material for the Cathedral was limestone, imported from Caen in Normandy. To transport the building stone to the site, a canal was cut from the river (from the site of present-day Pulls Ferry), all the way