How has Lewes castle changed over time?

Answer 1

because the wood which they were made of would rot and it was frequently being attacked with fire and the castles were burning down. They replaced the wood with stone and moved the castles if they needed to be in a better position.

Answer 2

The Motte and bailey castle was built by William de Warenne around 1070. This was a wooden tower on a motte (there were two mottes which is very unusual) This was replaced by a stone shell keep early in the 12th century. Domestic buildings were also built in the keep around this time. Two semi octagonal towers were added to the shell walls at this time. The last improvement in defence in 1350 was a barbican. Soon after this the castle was deserted and fell into disrepair.