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Valle Crucis Abbey (Valley of the Cross) is a Cistercian abbey. More formally the Abbey Church of the Blessed Virgin Mary.
The Abbey was founded in 1201 by Madog ap Gruffydd Maelor, on the site of a temporary wooden church and was the last Cistercian monastery to be built in Wales.
Madog was buried in the then-completed abbey upon his death in 1236. Not long after Madog's death, it is believed that a serious fire badly damaged the abbey.
Madog's heraldic slab was excavated from the site in 1956.