The monastic site was found by Saint Moling at some point in the 7th century.

[2] It was renowned as a place of pilgrimage potentially since the pre-Christian period, when people may have traveled to the site to celebrate Lughnasadh.

[3] In the early ninth century the monastery was plundered by vikings.

[2] In 1158, St Mullin's was granted to Ferns Abbey, part of the Augustinian order.

[2] A disused Anglican church is the northernmost building on the grounds,[4] and was built in 1811.