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Ellesmere ( ELZ-meer) is a market town near Oswestry in north Shropshire, England, notable for its proximity to a number of prominent Meres.

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.

St Mary's Church stands on a hill in the town of Ellesmere, Shropshire, England. It is an active Anglican parish church in the deanery of Ellesmere, the archdeaconry of Salop, and the diocese of Lichfield. The church is recorded in the National Heritage List for England as a designated Grade I listed building.