GREETING CARDS - LANDSCAPES NORTH EAST OF ENGLAND  AD100 AD118 AD122 AD126 AD127 AD131 AD139 AD147 AD150 AAD118 - Entrance to Durham Castle Well known to all who visit the Palace Green and the Cathedral opposite, this gatehouse forms an imposing entrance to Durham Castle. The Castle was once home to the Prince Bishops of Durham, on the site of a fortress built by William the Conqueror in 1072 to defend the borders against Scotland. Since the foundation of Durham University in the 1830’s, Durham Castle has been a residential college to many hundreds of university students.