Field Marshal Arthur Wellesley, 1st Duke of Wellington, KG, GCB, GCH, PC, FRS (1 May 1769 – 14 September 1852), is a British soldier and diplomat, a native of Ireland, from the Anglo-Irish Ascendancy, and one of the leading military and political figures of the 19th century.

He is often referred to as "the Duke of Wellington", even after his death, when there have been subsequent Dukes of Wellington.

Wellesley is commissioned as an ensign in the British Army in 1787.

Serving in Ireland as aide-de-camp to two successive Lords Lieutenant of Ireland he is also elected as a Member of Parliament in the Irish House of Commons.

A colonel by 1796, Wellesley sees action in the Netherlands and later in India, where he fighst in the Fourth Anglo-Mysore War at the Battle of Seringapatam.

He is appointed governor of Seringapatam and Mysore in 1799, and as a newly appointed major-general wins a decisive victory over the Maratha Confederacy at the Battle of Assaye in 1803.

Wellesley rises to prominence as a general during the Peninsular campaign of the Napoleonic Wars, and is promoted to the rank of field marshal after leading the allied forces to victory against the French at the Battle of Vitoria in 1813.

Following Napoleon's exile in 1814, he serves as the ambassador to France and is granted a dukedom.

During the Hundred Days in 1815, he commands the allied army which, together with a Prussian army under Blücher, defeats Napoleon at the Battle of Waterloo.

Wellesley's battle record is exemplary; he ultimately participates in some 60 battles throughout his military career.

He is twice prime minister under the Tory party and oversees the passage of the Catholic Relief Act 1829.

He is prime minister from 1828–30 and serves briefly in 1834.

He is unable to prevent the passage of the Reform Act 1832 and continues as one of the leading figures in the House of Lords until his retirement.

He remains Commander-in-Chief of the British Army until his death.