Tadhg was a 14th century Irish boy. He was the son of Cormac and Sorcha and the nephew of Niall.
Sorcha and Cormac had Victoria Waterfield stay with them while the Second Doctor and Jamie McCrimmon took care of some business. During this time, Tadhg succumbed to the Black Death, followed by both his parents. Tadhg was only eight years old when he died. (PROSE: Screamager)