The peerage title Earl of Ormond and the related titles Duke of Ormonde and Marquess of Ormonde have a long and complex history. An earldom of Ormond has been created three times in the Peerage of Ireland. It was originally created in 1328 for James Butler. The fifth earl was created Earl of Wiltshire (1449) in the Peerage of England, but he was attainted in 1461 and his peerages were declared forfeit. The earldom of Ormond was restored to his younger brother, John Butler, the sixth earl. The de facto, if not indeed the de jure earl, Piers Butler, was induced to resign his rights to the title in 1528. This facilitated the next creation by awarding the titles of Ormond and Wiltshire to Thomas Boleyn, who was the father of Anne Boleyn. At that time, Anne was the mistress of King Henry VIII of England. As a maternal grandson of the 7th Earl, Thomas Boleyn has a slim claim to the title. Through his daughter, Anne, he was the grandfather of Elizabeth I of England. On the death of Boleyn, these peerages of the second creation became extinct because he lacked male heirs, his son George having been executed for treason.
As a reward for his patriotism and generosity, Piers Butler, a cousin of the 7th Earl, was created Earl of Ossory five days after resigning his rights to the other titles. The third creation for Piers Butler (in 1538) merely recognised the reality of the situation prior to the Boleyn irruption. The fifth earl of this creation was made Marquess of Ormonde (1642) and Duke of Ormonde (1660) in the Peerage of Ireland, and Duke of Ormonde (1682) in the Peerage of England.
Prior to the creation of the Earldom of Ormond, the 1st earl's father had been created the first Earl of Carrick. However, this title did not pass to James Butler. After a gap of 7 years following his father's death, James was rewarded with an earldom in his own right - Ormond. After 1682, the spelling "Ormonde" was used almost universally. Subsidiary titles for the duke were Earl of Brecknock (1660) and Baron Butler (1660) in the Peerage of England and Earl of Ormond (1328), Earl of Ossory (1538) and Viscount Thurles (1536) in the Peerage of Ireland. In 1715 the second duke was attainted and his English peerages declared forfeit. In 1758 the de jure third duke (Irish) died and the dukedom and marquessate became extinct. The eleventh earl was created the Marquess of Ormonde in the Peerage of Ireland in 1816, on his death that title became extinct and the earldoms passed to his brother, for whom the title Marquess of Ormonde was created in the Peerage of the United Kingdom in 1825. That title became extinct in 1997, while the earldom became dormant.
An unrelated Earldom of Ormonde was twice created in the Peerage of Scotland.
The presumed successors of the 7th marquess in the Earldoms of Ormonde and Ossory have been the 17th and 18th Viscount Mountgarret, descending in the male line from a younger son of the 8th Earl, but the claim has not been proven, because there is still the chance of possible male descendants of sons of the 9th earl.