Illtud, also known as Illtud Farchog or Illtud the Knight, is venerated as the abbot teacher of the divinity school, Bangor Illtyd, located in Llanilltud Fawr in Glamorgan, Wales. He founded the monastery and college in the 6th century, and the school is believed to be Britain's earliest centre of learning. At its height, it had over a thousand pupils and schooled many of the great saints of the age, such as David, Samson of Dol, and the historian Gildas.

Llantwit Major is a town and community in Wales on the Bristol Channel coast. It is one of four towns in the Vale of Glamorgan, with the third largest population after Barry and Penarth, and ahead of Cowbridge. It is 4+1⁄2 miles (7.2 km) from Cowbridge, 9 miles (14 km) from Bridgend, 10 miles (16 km) from Barry, and 15 miles (24 km) from Cardiff. It had a population of 9,530 in 2021.