St Mary's Church is an Anglican parish church in the English village of Welwick in the East Riding of Yorkshire. It is a Grade I listed building. History The church consists of a west tower of two stages, a four-bay aisled nave (with clerestory) entered through a south porch, and a three-bay chancel. The building material used throughout (except for the later south porch and aisle parapet, built of brick) is limestone in the form of cobble and ashlar. The earliest remains of previous churches on the site date to the 13th century, and are incorporated into the present structure. These include the arch between tower and nave, the eastern corners of the nave, and the western portion of the chancel. Above the tower arch is an asymmetrically set blocked doorway. But the majority of the work is from a rebuilding which occurred during the first half of the 14th century, i.e. entirely during the Decorated period, when aisles and a clerestory were added to the nave and the chancel was extended eastward. The tower was rebuilt during the 15th century, and the south porch during the 18th making use of the original south door. Architecture Exterior The windows of the nave all feature typical early- to mid-14th century tracery. The forms of these windows are varied, some pointed, some segment-headed, several (three of the four aisle end windows) square-headed: the masons of the East Riding during this time commonly employed square-headed windows, adapting Decorated tracery motifs for use in them (see St Helen’s Church, Skipwith, the foremost example). Buttresses are used between bays and at the angles. There is an elaborate projection below a window on the south aisle wall; this is only explained when one goes inside the building (see below). The nave clerestory has three windows on each side, of two lights with cusped Y-tracery. The original nave gable can be traced below the 14th-century gable, which carries a cross, as does the chancel gable. The western portions of the chancel walls are of the 13th century, with an original lancet window on the north side, and on the south side a window of two trefoiled lights with an unencircled quatrefoil above. The rest of the chancel is of the 14th-century extension. This part has two large pointed three-light windows on each side, all with graceful flowing tracery of the same pattern. The southeast window was later