Wisbech castle was a motte-and-bailey castle built to fortify Wisbech, in the Fenland area of Cambridgeshire, England by William I in 1072. The Norman castle, reputedly was destroyed during a devastating flood of 1236, the original design and layout is still unknown. In the 15th century repairs were becoming too much for the ageing structure, and it was decided to create a new building, starting in 1478 under Bishop Morton of Ely (later Archbishop of Canterbury and Chancellor of England). His successor, Bishop Alcock, extended and completed the re-building and died in the Castle in 1500. Subsequent bishops also spent considerable sums on this new palace. The Bishop's Palace was built of brick with dressings of Ketton Stone, but its exact location is unknown.