The larger belonged to the Norman nobleman Robert D'Oyly and the smaller to his brother in arms Roger d'Ivry.The easternmost bay of the arcade for the south aisle was built in about 1180 and the bell tower was added early in the 13th century.The architect of the 1873 works was William Wilkinson of Oxford, whose commissions included several clergy houses in Oxfordshire.The Bicester–Enstone road that forms part of the parish's northern boundary has existed at least since 1255 when a bridge was built at Lower Heyford to carry it across the River Cherwell.[1] In 1636 Sir Robert Dormer, lord of the manor of Rousham, refused to pay ship money.The enclosure of the parish's remaining common lands in 1775 was by agreement between the landowners[1] without recourse to an Act of Parliament.Between 1845 and 1850 the Oxford and Rugby Railway was built, passing through the eastern margin of the parish beside the River Cherwell.[1] The station is now part of the Cherwell Valley Line and is served by Great Western Railway trains.
Late 12th-century chancel of SS Leonard & James', restored and altered in 1867–68
South aisle of SS Leonard & James': east arch (left) late 12th century; middle and west arches early 13th century
SS Leonard & James': early 16th-century Perpendicular Gothic large window in the north wall of the nave
Monument to John Dormer (died 1581) and his wife Elizabeth, originally erected in
St. Mary the Virgin, Steeple Barton
but brought to Rousham and installed in the chancel here in 1851