[a] After his son and heir, Gilbert, died childless before 1189, the earldom passed through Richard's daughter Isabel de Clare and to her husband, William Marshal.

[1] During the Middle Ages, official documents, with few exceptions, were written in Latin; in the Domesday Exchequer annals, written between 1300 and 1304 (that means, over 120 years after Richard's death), he was referred to as "Ricardus cognomento Stranghose Comes Strugulliae", which translates to "Richard, known as Stranghose, earl of Striguil" (modern Chepstow).

Since Henry II's letter to Dermot was general in nature, Richard wanted to obtain the king's specific consent to travel to Ireland.

On 23 August 1170, Richard embarked on his ships at Milford Haven to join the force; however, a royal messenger arrived to forbid him to go.

At the same time he sent his uncle, Hervey de Montmorency, on an embassy to Henry II to appease the king who was growing worried with Richard's increasing power.

Henry offered to return Richard's lands in France, England and Wales (which he had confiscated) in exchange for the conquered possessions in Ireland.

Isabel, on the wishes of Henry II and his son Richard the Lionheart, was given in spouse to William Marshal, who became the Earl of Pembroke for jure uxoris.

[23] Their children were: Richard de Clare was first interred in Dublin's Christ Church Cathedral, where a purported tomb effigy is located.

[26] Next to it lies a "smaller half-sized monument"[27] which Richard Stanyhurst claimed was "that of Strongbow’s son, whom his father had cleft in twain for cowardice in battle",[27] although "no contemporary authors"[27] mention any such tale.

"[27] Richard de Clare was buried in Christ Church Cathedral, Dublin, within sight of the cross according to an eyewitness, Giraldus Cambrensis.