William Conyngham

William Burton Conyngham (1733 – 31 May 1796) was an Anglo-Irish politician.

Life He was born William Burton, the second son of Francis Burton and Mary Conyngham, sister of Henry Conyngham, 1st Earl Conyngham. In 1781, his name was changed by Royal Licence to inherit the estates of his uncle.

He was a student at Queens' College, Cambridge from 1750 and in turn at Lincoln's Inn from 1753, he then proceeded to follow a military career, being commissioned as a Captain in 1759, and by 1769 he had advanced to Lieutenant-Colonel in the 12th Dragoons. He resigned his Regular Army commission in 1774, but in April 1793 he was appointed Colonel to raise and command the new Prince of Wales's Own Donegal Militia.

Conyngham was a longtime Member of Parliament. From 1761 to 1777 he represented Newtown Limavady,

In 1785 Conyngham commenced the building of Slane Castle, assisted by his nephew the 1st Marquess Conyngham, on a site overlooking the River Boyne just a few kilometres upstream from the site of the Battle of the Boyne.

From 1793 Conyngham was one of the Commissioners of the Treasury for Ireland.

Conyngham is most famous today for having presented the Trinity College Harp to Trinity College Dublin; from 1922 the harp was used as the model for the insignia of the Irish Free State and the Republic of Ireland. An image was also registered as a Guinness trade mark in 1876.