Earl of Cavan is a title in the Peerage of Ireland. It was created in 1647 for Charles Lambart, 2nd Baron Lambart. He was made Viscount Kilcoursie, in the King's County, at the same time, also in the Peerage of Ireland. Lord Cavan was the son of Oliver Lambart, who had been elevated to the Peerage of Ireland as Lord Lambart, Baron of Cavan in the County of Cavan, in 1618).
The 7th Earl of Cavan was a general during the Napoleonic Wars, he was succeeded by his grandson the 8th Earl. The 10th Earl was an army commander during the First World War and later a British Field Marshal and Chief of the Imperial General Staff. As he died without male issue, he was succeeded by his youngest brother the 11th Earl. When the 12th Earl died, the title passed to Roger Cavan Lambart, a descendant of the 7th Earl.
Oliver Lambart, 1st Baron Lambart (died 1618)
Charles Lambart, 2nd Baron Lambart (created Earl of Cavan in 1647)
Charles Lambart, 1st Earl of Cavan (1600–1660)
Richard Lambart, 2nd Earl of Cavan (died 1690)
Charles Lambart, 3rd Earl of Cavan (1649–1702)
Charles Lambart, Lord Lambart (died c. 1689)
Richard Lambart, 4th Earl of Cavan (died 1742)
Gilbert Lambart, Lord Lambart (died before 1742)
Ford Lambart, 5th Earl of Cavan (1718–1772)
Richard Lambart, 6th Earl of Cavan (died 1778)
Richard Ford William Lambart, 7th Earl of Cavan (1763–1837)
Richard Henry Robert Gilbert Lambart, Viscount Kilcoursie (1783–1785)
Richard Henry Lambart, Viscount Kilcoursie (1788–1788)
George Frederick Augustus Lambart, Viscount Kilcoursie (1789–1828)
Frederick John William Lambart, 8th Earl of Cavan (1815–1887)
Frederick Edward Gould Lambart, 9th Earl of Cavan (1839–1900)
Frederick Rudolph Lambart, 10th Earl of Cavan (1865–1946) (Representative peer from 1915)
Horace Edward Samuel Lambart, 11th Earl of Cavan (1878–1950)
Michael Edward Oliver Lambart, 12th Earl of Cavan (1911–1988)
Roger Cavan Lambart, 13th Earl of Cavan (born 1944)
Earl of Cavan Wikipedia
There is no heir to the titles.