- was founded by William, Earl of Gloucester, for the Augustinian Canons Regular around 1170 and survived until 1539. The remains have been designated as a Grade I listed building and Scheduled Ancient Monument
- The abbey was founded following the dying wish of William's son Robert, although there had been a religious settlement in Keynsham during the 9th and 10th centuries.
- After the dissolution in 1539, when the abbey and its possessions were surrendered to Henry VIII, the site was occupied by a house built by the Bridges family. In 1559 Thomas Bridges bequeathed stone from the late Abbey Church for the repair of the Bridge and causeway over the nearby River Avon. The house built by the Bridges family was demolished in 1776.
- The arms of the abbey included six golden clarions or trumpets on a red ground, from the de Clares, Earls of Gloucester.[6]
- The site was excavated during the building of the Keynsham bypass in the 1960s. Amongst the finds was a fipple flute, a type of early recorder.
"KEYNSHAM,
a hundred in county Somerset.
It contains the parishes of Brislington, Burnett, Chelwood, Compton-Dando, Farmborough, Keynsham, Marksbury, Nempnett Thrubwell, Pensford. Priston, Publow, Queen Charlton, Saltford, Stanton-Drew, Stanton-Prior, and Whitchurch, comprising 24,520 acres."