Motte-and-bailey castle
Following the Norman Conquest, Richard Fitz Gilbert was granted land in Kent to guard the crossing of the River Medway. He erected a simple Motte-and-bailey castle on the site. To dig the moat and erect the motte 50,000 tonnes of earth were moved. In 1088, the de Clare family (descendants of Fitz Gilbert) rebelled against King William II. His army besieged the castle. After holding for two days the castle fell and as punishment the king had both the castle and the town of Tonbridge burnt to the ground. Before 1100, the de Clares replaced the wooden castle with a stone shell keep. This was reinforced during the thirteenth century, and in 1295 a stone wall was built around the town.