Title: Murchertach O'Brien, high king of Ireland, and his Norman son-on-law, Arnulf De Montgomery, circa 1100
Subjects: History, Kings and rulers, Normans, Politics and government
Places: Ireland
People: Arnulf De Montgomery (ca. 1068-ca. 1122), Murtough O'Brien (d. 1118)
Time periods: To 1172, To 1500