D. H. Lawrence and Alan Sillitoe having links to the city, as well as a contemporary literary community, a publishing industry and a poetry scene. The city is served by three universities: the University of Nottingham, Nottingham Trent University and the Nottingham campus of the University of Law; it hosts the highest concentration of higher education providers in the East Midlands. Toponym The name of Nottingham is Anglo-Saxon in origin. A Saxon chieftain named Snot ruled an area known as in Old English; the homestead of Snot's people ( = 'the people of'; = 'homestead'). Some authors derive Nottingham from (caves) and (homestead) but "this has nothing to do with the English form". A settlement existed before the arrival of the Anglo Saxons in the early 7th century CE because it is known in the Brythonic as , meaning Place of Caves (known also as "City of Caves"). In modern Welsh, Nottingham is known poetically as and in Irish as , 'The Cavey Dwelling'. History Nottingham Castle was constructed in 1068 on a sandstone outcrop by the River Leen. The Anglo-Saxon settlement was originally confined to the area today known as the Lace Market and was surrounded by a substantial defensive ditch and rampart, which fell out of use following the Norman Conquest and was filled by the time of the Domesday Survey (1086). Following the Norman Conquest the Saxon settlement developed into the English Borough of Nottingham and housed a Town Hall and Law Courts. A settlement also developed around the castle on the hill opposite and was the French borough supporting the Normans in the castle. Eventually, the space between was built on as the town grew and the Old Market Square became the focus of Nottingham several centuries later. Defences consisted initially of a ditch and bank in the early 12th century. The ditch was later widened, in the mid-13th century, and a stone wall built around much of the perimeter of the town. A short length of the wall survives, and is visible at the northern end of Maid Marian Way, and is protected as a Scheduled Monument. On the return of King Richard the Lionheart from the Crusades in 1194, the castle was occupied by supporters of Prince John, including the Sheriff of Nottingham. It was besieged by Richard and, after a sharp conflict, was captured. In the legends of Robin Hood, Nottingham Castle is