As an illegitimate son, Gruffydd had no formal claim to estates but could expect some consideration. He was a hostage in the hands of king John until 1215 and on release began to press for lands, involving him in frequent disputes with his father and his half-brother, Dafydd. After a period of imprisonment, Llywelyn released him in 1234 and gave him territory in Powys. His half-brother then deposed him and held him captive in Criccieth. In 1241 he obtained the help of Henry III, who transferred him to the Tower of London in honourable imprisonment. While attempting to escape, Gruffydd broke his neck when the linen sheets tore. His sons, Llywelyn and Dafydd, were the last native princes of Wales.
From The Kings and Queens of Britain in Oxford Reference.
Subjects: British History.