Family/Spouse: Princess of Wales Gwladys "The Dark" verch Llewelyn. Gwladys (daughter of Llywelyn Fawr ap Iowerth, Prince of Wales and Tangwystl verch Lywarch) was born in 1205 in Caerarvonshire, Wales; died in 1251 in Winsor, Berkshire, England. [Group Sheet] [Family Chart]