The title of Earl of Desmond has been held historically by lords in Ireland, first as a title outside of the peerage system and later as part of the English-controlled Peerage of Ireland.
The original Earldom of Desmond, based on land holdings in Munster belonged the Anglo-NormanFitzgerald family, which was founded by Maurice Fitzgerald de Windsor, a key supporter of Strongbow in his invasion of Ireland. The title Earl of Desmond was first claimed by another Maurice Fitzgerald in approximately 1329[1] (http://www.compapp.dcu.ie/~humphrys/FamTree/Fitzgerald/1st.earl.desmond.html). Over time, according to English sources, the Fitzgerald family became highly assimilated to the local Irish culture.
The final Fitzgerald Earl of Desmond was Gerald Fitzgerald, the 15th (or, by some counts, the 16th) Earl. The Fitzgeralds had resisted the Reformation of King Henry VIII and, after a series of rebellions, Gerald Fitzgerald was defeated and killed on November 11, 1583. His title, along with the enormous estates of his family, were forfeit to the English crown. Gerald's nephew, James Fitzgerald attempted to regain control of both, but he was captured by the English and executed in 1603.
The Desmond estates were held by a doubtful title, and claims on them were made by the Butlers, the hereditary enemies of the Geraldines, for James Butler, 9th Earl of Ormonde had married Lady Joan Fitzgerald, daughter and heiress-general of James FitzGerald, 10th Earl of Desmond.
The effect of this marriage was a temporary cessation of open hostility between the Desmonds and her son, Thomas Butler, 10th Earl of Ormonde.
In the meanwhile Desmond's cousin, James Fitzmaurice Fitzgerald, caused himself to be acclaimed captain of Desmond in defiance of Philip Sidney, and in the evident expectation of usurping the earldom.
The original Earldom of Desmond, based on land holdings in Munster belonged the Anglo-NormanFitzGerald family, which was founded by Maurice FitzGerald, a key supporter of Lord Pembroke ("Strongbow") in his invasion of Ireland.
The final Earl of Desmond of this creation was Gerald FitzGerald, the 15th (or, by some counts, the 16th) Earl.
William Feilding, 2nd Earl of Desmond (1640-1685) (succeeded as 3rd Earl of Denbigh in 1675)