Earl of Mayo  Earl of the County of Mayo, usually known simply as Earl of Mayo, is a title in the Peerage of Ireland. It was created in 1785 for John Bourke, 1st Viscount Mayo (of the second creation). For many years he served as "First Commissioner of Revenue" in Ireland. He had already been created Baron Naas, of Naas in the county of Kildare, in 1776, and Viscount Mayo, of Moneycrower in the county of Mayo, in 1781, also in the Peerage of Ireland. This branch of the Bourke family descends from John Bourke, fourth son of Sir Thomas Bourke (died 1397), whose second son Edmund was the ancestor of the Viscounts Mayo (of the first creation). Before becoming Viscounts and Earls of Mayo, the senior branch of the family held the Gaelic title Mac William Íochtar and received the White Rod. The Earls of Clanricarde were members of another branch of the De Burgh dynasty. Lord Mayo was succeeded by his eldest son John, the second Earl, who was a member of the Irish House of Commons. On his death the titles passed to his younger brother, the third Earl. He was a prominent Anglican clergyman and served as Bishop of Leighlin from 1772 to 1782 and as Archbishop of Tuam from 1782 to 1794. He was succeeded by his eldest son, the fourth Earl. He sat in the House of Lords as an Irish representative peer from 1816 to 1849. On his death the titles passed to his nephew, the fifth Earl. He was an Irish representative peer in the House of Lords from 1852 to 1867. His eldest son, the sixth Earl, was a prominent Conservative politician. Known for most of his life under his courtesy title of Lord Naas, he was three times Chief Secretary for Ireland and served as Viceroy and Governor-General of India from 1869 to 1872, when he was assassinated on the Andaman Islands. He was succeeded by his eldest son, the seventh Earl. He sat in the House of Lords as an Irish representative peer from 1890 to 1927 and was a Member of the Senate of the Irish Free State from 1922 to 1927. This line of the family expired on his death in 1927 and the titles passed to the late Earl's first cousin, the eighth Earl. He was the son of the Reverend The Hon. George Wingfield Bourke, fourth son of the fifth Earl.