Gui I DE MONTLHERI was born in 1009. Gui I DE MONTLHERI's father was Thribaut DE MONTLHERI and his mother was DE MONTLHERI. He was an only child. He died at the age of 86 in 1095 in Lonpont as a monk.
General Notes
Founded the first 5 Royal Tribes and restored the Crown ofGweynedd in 1081. Was imprisoned by the Normans in Chester in1081-1093 in Bangor Cathedral.