- Kingdom: Calchvynedd
- Coordinates: 54.41 North, 3.48 West
- OS Grid Reference: SS9768
Llanilltud was located in an area dominated by religious establishments and very little political power. As the most prestigious of all monasteries, the era of Illtud was marked by widely-held fame and respect.
In the late fifth century, Illtud founded a church and college at the sight after his military career was over. Because of its location and his own exceptional learning, Llanilltud immediately became the center of learning among the Britons.