St Mary in the Marsh is a small village in one of the more remote areas of the Romney Marsh, sited about 3 miles from New Romney and 2 miles from St Mary's Bay in SE Kent. The parish church of St Mary is mostly of later medieval date, with a nave with N and Saisles, a 13th-c chancel, and a W tower. The only surviving Romanesque sculpture is the tower arch.

The settlement is not mentioned in Domesday Book but the site, originally named 'Siwold's Circe', is believed to have Anglo-Saxon origins. The Archbishop was patron.

The chancel and the tower are both thought to have been built in the 12thc, but there is no associated sculpture. The Romanesque work is often given the very precise date of 1133 in some online literature, but the reason for this cannot be ascertained.