Ralph Agas's map of Oxford in 1578 shows that by then, while the curtain wall, keep and towers remained, the barbican had been demolished to make way for houses. Hassall, 1976, states that by 1600 the moat was almost entirely silted up and houses had been built all around the edge of the bailey wall,[40] although this is contradicted by the castle's appearance in John Speed's map of Oxford, 1605. In 1611 King James I sold Oxford Castle to Francis James and Robert Younglove, who in turn sold it to Christ Church College in 1613.