Harswell was a berewick of Warter, as were Thorpe-le-Street and Nunburnholme. The manor had been held by Morcar, but the Domesday Book records is was held by the king. There was a priest and a church - presumably at Warter. Associated, but not contiguous, soclands (Duggleby and East Lutton) were waste, and the value of the manor markedly decreased from £40 to 30s (VCH II, 197). The king’s holding at Harswell was one carucate (VCH II, 320).
Stapleton (c. 1965-6) says that around 1180 William Salvin held the estate and wished the abbot of Selby to present a priest. Stapleton also reports that there is a drawing of the church in the parish records of Holme on Spalding Moor, showing the church in 1840. There was no porch, but a small bell tower; the roof of the nave was lower than that of the chancel and appeared to be of a different material; two windows on the N side and the priest’s doorway on the S had been bricked up. The caption says that the drawing depicts ‘a small and much defaced building’.