Shelswell is a hamlet in Oxfordshire about 4 miles (6.4 km) south of Brackley in neighbouring Northamptonshire.
Shelswell's toponym comes from Old English and suggest's that the settlement may originally have been the well belonging to Scield, a Saxon settler. The spring that gave rise to this well is no longer traceable. The toponym was "Scaldeswelle" in 1180 and "Saldeywell" in 1219 before evolving into the present form.
Before the Norman Conquest of England the manor of Shelswell belonged to a Saxon called Edwin, but the Domesday Book records that by 1086 Shelswell had been granted to Geoffrey de Montbray, Bishop of Coutances. In 1093 the Bishop left Shelswell to his nephew Robert de Mowbray, Earl of Northumbria, but in 1095 the Earl was imprisoned and forfeited his estates for rebelling against William Rufus. By the 12th century Robert, 1st Earl of Gloucester, an illegitimate son of Henry I, was Shelswell's feudal overlord. Shelswell remained part of the honour of Gloucester during the 13th century and apparently as late as 1560.Sir Anthony Cope, 1st Baronet of Hanwell, Oxfordshire bought Shelswell in 1595 and it remained with the family of the Cope baronets until after 1675.