Marquess Wellesley

Earl of Mornington is a title in the Peerage of Ireland. It was created in 1760 for the Anglo-Irish politician and composer Garret Wellesley, 2nd Baron Mornington. On the death of the fifth earl in 1863 it passed to the Duke of Wellington.

The first earl was the eldest son of Richard Wesley, the first Baron Mornington. Richard Wesley, born Richard Colley, was elevated to the Peerage of Ireland as Baron Mornington in 1746. He had inherited the Dangan and Mornington estates in County Meath on the death of his first cousin Garret Wesley in 1728. In the same year he was granted by Royal licence the new surname of Wesley (see below for earlier history of the family).

His son, the second Baron, was made the first Earl of Mornington in 1760, and at the same time also became Viscount Wellesley, of Dangan Castle in the County of Meath, also in the Peerage of Ireland.

Four of the first earl's sons gained distinction. The third son was Arthur Wellesley, 1st Duke of Wellington, who defeated Napoleon Bonaparte at the Battle of Waterloo in 1815 (see Duke of Wellington), while the fifth was the diplomat Henry Wellesley, 1st Baron Cowley (see Earl Cowley).

The first earl was succeeded by his eldest son, Richard, the second earl. He used the original family surname of Wellesley in lieu of Wesley. He was a prominent soldier, diplomat and politician. In 1797 he was created Baron Wellesley, of Wellesley in the County of Somerset, in the Peerage of Great Britain, which entitled him to a seat in the British House of Lords. In 1799 he was further honoured when he was made Marquess Wellesley, of Norragh, in the Peerage of Ireland. However, he was said to be bitterly disappointed at not receiving a dukedom or at least an English peerage of high rank. He referred to his Irish marquessate as a "double-gilt potato". Lord Wellesley had several children by his French mistress, Hyacinthe-Gabrielle Roland (they were married in 1794 after the birth of their children). One of them, Anne, married as her second husband Lord Charles Bentinck. They were great-great-grandparents of Queen Elizabeth II.

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