Caerleon is the historically important site of the Roman legionary fortress of Isca Augusta. St Cadoc's Church stands over the principia (headquarters), where the legionary standards were kept and statues of the Roman emperors venerated. The earliest surviving part of the church dates back to just after the kingdom of Glywysing was overrun by the Normans during the twelfth century and is thought to be the work of Hywel ap Iowerth, who was also the founder of the Cistercian Llantarnam Abbey.
The current church is in the Perpendicular style, which was fashionable in the fifteenth century. The tower, which stands at the southwest corner of the church, has a lower stage that was probably part of the original Norman church, incorporating twelfth/thirteenth century lancet windows. The church features a series of impressive stained-glass windows depicting the life of Christ and symbolising the faith and devotion of the saints associated with Caerleon.
References:Saint-Georges de Boscherville Abbey is a former Benedictine abbey. It was founded in about 1113 by Guillaume de Tancarville on the site of an earlier establishment of secular canons and settled by monks from the Abbey of Saint-Evroul. The abbey church made of Caumont stone was erected from 1113 to 1140. The Norman builders aimed to have very well-lit naves and they did this by means of tall, large windows, initially made possible by a wooden ceiling, which prevented uplift, although this was replaced by a Gothic vault in the 13th century. The chapter room was built after the abbey church and dates from the last quarter of the 12th century.
The arrival of the Maurist monks in 1659, after the disasters of the Wars of Religion, helped to get the abbey back on a firmer spiritual, architectural and economic footing. They erected a large monastic building one wing of which fitted tightly around the chapter house (which was otherwise left as it was).