The Victoria County History dates this rebuilding to the early part of the 13th century[1] but Sherwood and Pevsner attribute the work to about 1300.

[2] Early in the 14th century the south aisle was rebuilt on a larger scale in the Decorated Gothic style.

[1] Early in the 18th century St. Mary's was reported to be in good condition, but by 1775 the chancel was ruinous and its roof had fallen in.

[1] In 1896-97 the Gothic Revival architect Ninian Comper rebuilt the chancel,[3] possibly working with his partner William Bucknall.

[5] By 1161 Jordan de Say, who owned the manor of Souldern, had given the advowson of the parish to the Benedictine Eynsham Abbey.

[1] In 1544 Henry VIII sold the advowson to Sir Ralph Sadler, but thereafter it changed hands several times.

[1] By the 1650s a William Norbury of Hanwell owned George Throckmorton's claim and sold it to the Rector of Souldern.