The Salt Tower was built around 1230 as part of Henry III’s curtain wall. It has an upper chamber which has been used as accommodation for prisoners. The most famous of these was John Balliol, King of Scots from 1296-1299. It has a display of prisoner graffiti.

The E is thought to refer to the future Elizabeth the First. The signature is of John Baptiste Catiglione, Elizabeth’s Italian tutor who was imprisoned here by Queen Mary.