St Mary's was built on the site of an earlier church at which Bishop Robert de Bingham was consecrated in 1229 before the completion of his cathedral church at Salisbury;[2] his statue is still visible on the west gable.[1] By the 9th century the Benedictineconvent of Wilton Abbey was attached to the church.[1] During the 14th and 15th centuries other medieval churches in Wilton closed and combined with St Mary's which was rebuilt and expanded to become, by the 16th century, the sole parish church.[3] In 1441 parish records include the purchase of a great bell and c. 1628 a carved pulpit was installed. In the early 19th century a parish rate was levied for the restoration of the church and a chandelier and pulpit sconces were bought to enable evening services.[4]
As a result, the old church was partially demolished, apart from the chancel and one bay of the nave. The ruins consist of the three arches of the south arcade, fragments of the north arcade and the altered eastern arch of the west tower or west window within the churchyard.[2]