There is documentary evidence that a Romanesque church existed by 1135. The C12th parish of Stanton Harcourt originally included the church of St Denis at Northmoor, and St James at South Leigh. Northmoor became a separate parish c.1148, but South Leigh remained a chapelry until 1868. Both the size of the parish and the scale of St Michael’s itself suggest that Stanton Harcourt was an early ecclesiastical centre. Queen Adela had granted the advowson to Reading Abbey before 1141, and this remained so until the Dissolution despite attempts by the Harcourts to secure the patronage.