CASTOR, a parish in the liberty of PETERBOROUGH, county of NORTHAMPTON, 4§ miles (W.) from Peterborough, comprising the chapelries of Sutton and Upton, and the hamlet of Ailesworth, and containing 959 inhabitants. The living is a rectory, in the archdeaconry of Northampton, and diocese of Peterborough, rated in the king's books at £52. 12. 8., and held in commendam with the see of Peterborough. The church, dedicated in 1124 to St Keneburgha, who founded a nunnery here, is a spacious cruciform edifice, with a beautiful Norman tower of two stages, surmounted by a spire, rising from the intersection: the three arches on the south side of the nave are semicircular, resting on massive round pillars; the opposite three are pointed, and supported by hexagonal columns. This village, and the opposite one of Chesterton, occupy the site of the Roman station Durobrivce, by the Saxons called Dormancester; a great quantity of coins from Trajan to Valens, fragments of urns, tiles, &c., have been discovered. The Roman highway, called Ermin-street, comjnenced here, and proceeding some distance, branched off into two divisions, the remains of which are still visible, one being called the Forty foot way, leading to Stamford, and the other Long Ditch, or High-street, running by Lolham-Bridges, through West Deeping, into Lincolnshire; together with what is termed Lady Keneburgha s way, which is supposed to have been', an ancient paved way leading from a fortress at the other side of the Nyne, which runs through the parish, to a castle on the hill, where the Roman governor resided: the place was destroyed by the Danes. Mr. John Landen, an eminent mathematician, was born here, in 1719.