Gruffydd ap Llywelyn

Gruffydd ap Llywelyn or Llewelyn (grĭf'ĭTH äp hləwĕl'ĭn, lūĕl'ĭn), d. 1063, ruler of Wales (1039-63). A series of campaigns against other Welsh princes made him the ruler of virtually all Wales. Allied with the outlawed Ælfgar of Mercia, he launched a series of raids into W England, but his power was broken by Harold in two invasions (1062-63). His defeat plunged Wales into confusion and paved the way for the conquest of Wales by the Normans. His name also appears as Griffith ap Llewelyn.