The article discusses Medieval aristocratic couple Isabel de Clare and William Marshal. Isabel was a notable heiress as the only surviving child of Richard fitz Gilbert de Clare, also known as Strongbow, and Aoife Mac Murchada, who owned Leinster, Ireland as well as extensive tracts of land in Wales, England and Normandy. After the death of her father, Isabel became a royal ward of King Richard of England who arranged her marriage to William Marshal, a professional soldier with Richard's court. The author describes the political intrigues and maneuvers of the couple, especially those involving King John of England, King Philip II of France, and King Henry III of England. INSETS: Isabel de Clare's pedigree;William marshal's pedigree.