Exeter Castle, also known as Rougemont Castle, is a historic medieval fortress built into the northern corner of Exeter's Roman city walls beginning in or shortly after 1068 in response to the city's rebellion against William the Conqueror. The castle's impressive gatehouse, preserved as a distinctive medieval structure, is celebrated as one of England's oldest standing castle buildings. Enlarged in the 12th century with an outer bailey, the castle gained particular historical notoriety as the venue for trying the three Devon Witches in 1682, the last people executed for witchcraft in England. King Stephen besieged the castle for three months in 1136, and it figures in Shakespeare's Richard III regarding that king's 1483 visit to Exeter. Devon's county court operated from the castle grounds beginning in 1607, cementing its role as an administrative and judicial centre. Today the castle grounds remain partially open to the public while the interior functions as an exclusive event venue for weddings, conferences, and special occasions in the heart of Devon.