Ellesmere Castle was in the town of Ellesmere, Shropshire. (grid reference SJ403347).This was a motte and bailey castle which was probably founded by Roger de Montgomerie, 1st Earl of Shrewsbury on a prominent hill to the east of the town, overlooking the Mere, soon after the Norman conquest. It was given to the Peverel family by Henry I but taken back by Henry II who granted it to Dafydd ab Owain Gwynedd, Prince of Gwynedd, in about 1177.