Earl of Limerick is a title that has been created twice in the Peerage of Ireland, associated first with the Dongan family, then with the Pery family.
Earl of Limerick Wikipedia
The earldom was created for the first time in 1686 for Sir William Dongan, 4th Baronet, with remainder, failing male issue of his own, to his brothers Robert, Michael and Thomas and the heirs male of their bodies. He was made Viscount Dungan, of Clane in the County of Kildare, at the same time, also in the Peerage of Ireland and with similar remainder. His only son Walter Dungan, Viscount Dungan, was killed at the Battle of the Boyne and Lord Limerick was succeeded according to the special remainders (and normally in the baronetcy) by his brother Thomas Dongan, the second Earl. He was Governor of New York from 1683 to 1688. All three titles became extinct on his death in 1715. The Dungan Baronetcy, of Castletown in the County of Kildare, was created in the Baronetage of Ireland in 1623 for Walter Dungan.
The title was created for the second time in 1803 in favour of Edmund Pery, 1st Viscount Limerick. He was the son of the Right Reverend William Pery, Bishop of Limerick from 1784 to 1794. In 1790 the latter was raised to the Peerage of Ireland as Baron Glentworth, of Mallow in the County of Cork. He was succeeded by his only son, the second Baron. He represented Limerick City in the Irish House of Commons and was a supporter of the Union with Great Britain. On 29 December 1800 he was created Viscount Limerick, of the City of Limerick, and on 11 February 1803 he was further honoured when he was made Earl of Limerick, of the County of Limerick. Both titles were in the Peerage of Ireland. Lord Limerick sat in the House of Lords as one of the 28 original Irish Representative Peers from 1800 to 1844. In 1815 he was also created Baron Foxford, of Stackpole Court in the County of Limerick, in the Peerage of the United Kingdom. His great-grandson, the third Earl, was a Conservative politician and served as Captain of the Yeomen of the Guard from 1889 to 1892 and from 1895 to 1896. He was succeeded by his eldest son, the fourth Earl. He died without surviving male issue and was succeeded by his half-brother, the fifth Earl. He was a soldier and also served as President of the Medical Research Council between 1952 and 1960. His eldest son, the sixth Earl, was a successful businessman. Lord Limerick also served as Under-Secretary of State of Trade from 1972 to 1974 in the Conservative administration of Edward Heath. As of 2014 the titles are held by his son, the seventh Earl, who succeeded in 2003.
Another member of the Pery family was Edmund Pery, 1st Viscount Pery, Speaker of the Irish House of Commons from 1771 to 1785. He was the elder brother of the first Baron Glentworth.
The heir to the earldom (improperly) uses the title Viscount Glentworth.
The family seat was Dromore Castle, near Pallaskenry, County Limerick.Sir Walter Dongan, 1st Baronet (died 1626)
Sir John Dongan, 2nd Baronet (died 1650)
Sir Walter Dongan, 3rd Baronet (died 1686)
Sir William Dongan, 4th Baronet (died 1698) (created Earl of Limerick in 1686)
William Dongan, 1st Earl of Limerick (died 1698)
Thomas Dongan, 2nd Earl of Limerick (1634–1715)
William Cecil Pery, 1st Baron Glentworth (1721–1794)
Edmund Henry Pery, 2nd Baron Glentworth (1758–1844) (created Earl of Limerick in 1803)
Edmund Henry Pery, 1st Earl of Limerick (1758–1844)
William Henry Tennison Pery, 2nd Earl of Limerick (1812–1866)
William Hale John Charles Pery, 3rd Earl of Limerick (1840–1896)
William Henry Edmund de Vere Sheaffe Pery, 4th Earl of Limerick (1863–1929)
Edmond Colquhoun Pery, 5th Earl of Limerick (1888–1967)
Patrick Edmund Pery, 6th Earl of Limerick (1930–2003)
Edmund Christopher Pery, 7th Earl of Limerick (born 1963)
The heir apparent is the present holder's son Felix Edmund Pery, Viscount Glentworth (born 1991).