 arnulf de montgomery ( 1066&ndash;1118Ã22), also known as arnulf of montgomery, was an anglo-norman magnate. a younger son of a leading magnate in normandy and england, arnulf played an active part in the anglo-norman invasion of southwestern wales in the late eleventh century. following his successes against the welsh, arnulf established himself at pembroke, built an earth and timber castle, and was likely rewarded with the title earl of pembroke. at the turn of the twelfth century arnulf reached his height, with his lordship including much of the former welsh kingdom of deheubarth and lands in yorkshire. a short time later, he joined his elder brother's rebellion against the king of england, and married a daughter of the king of munster in an effort to gain military support against his english sovereign. following the ultimate collapse of the rebellion, arnulf and his brothers were outlawed and banished from the realm, and arnulf appears to have spent much of the next twenty-odd years in a peripatetic life in ireland and normandy. ==background==  arnulf was likely born in the late 1060s,chandler 1989, p. 8. possibly about 1066.thompson 2004b. he was a younger son of roger de montgomery, vicomte of the hiÃ¨mois (d. 1094) and mabel de bellÃªme (d. 1077).mason 2004b; keats-rohan 1999, pp. 399&ndash;400. arnulf's parents likely married in about 1050.mason 2004b. his mother was a daughter, and eventual heiress, of guillaume de bellÃªme, lord of alenÃ§on (d. c. 1063). arnulf's father, an apparent kinsman and close companion of william, duke of normandy (d. 1087), was an eminent magnate in normandy.keats-rohan 1999, pp. 399&ndash;400; mason 1963, pp. 1&ndash;5. as tutor to matilda, duchess of normandy (d. 1083), roger and his eldest sons did not embark on the 1066 norman invasion of england. when william returned to normandy as king in 1067, roger accompa
1060s_births 12th-century_deaths Anglo-Normans Anglo-Normans_in_Ireland Anglo-Normans_in_Wales People_from_Pembrokeshire