The Benedictine monastery in Usk was founded in 1160 by Richard de Clare called Strongbow. It was one of only three female convents in medieval Wales. In addition, the priory church was also used as a parish church, and in the 13th century it was enlarged. At the beginning of the fifteenth century, the priory was destroyed, as a result of the Welsh uprising of Owain Glyndŵr. During the reconstruction, two new porches were erected, probably from the foundation of Sir William Herbert, the builder of the Raglan castle. After the dissolution of the monasteries in the late thirties of the sixteenth century, the church of St. Mary only served as the parish church. Unfortunately, during the Reformation, the presbytery, transepts and most of the priory buildings were destroyed. A major renovation and expansion was carried out in 1884, when Thomas Henry Wyatt roofed the passage next to the tower, creating a sacristy and added another span to the nave. Another renovation was undertaken in the years 1899-1900, when new windows were inserted and the roof of the naves was replaced.
The church from the twelfth century consisted of a rectangular nave, four-sided tower, northern and southern transept and chancel. The presbytery and transepts were ended from the east with semicircular apses, a rare solution in Wales. In the 13th century, a rectangular northern nave was added, covered with a separate, gable roof. Two centuries later it was further expanded. In the Middle Ages, the central nave (intended for the nuns), was separated from the northern aisle (intended for the lay people), by a form of a screen, or rood screnn. Another carved and painted rood screen from the fifteenth century, preserved to this day, separated the presbytery from the nave. Also in the fifteenth century, two porches were added to the aisles, in the style of the English perpendicular gothic. One was placed from the west side and the other from the north side. In the near distance from the church you can see the gatehouse leading to the area of the former priory.
Wooding J., Yates N., A Guide to the churches and chapels of Wales, Cardiff 2011.
Website britishlistedbuildings.co.uk, Priory Church of St Mary A Grade I Listed Building in Usk, Monmouthshire.