William Power Keating Trench, 1st Earl of Clancarty (23 June 1741 – 27 April 1805) was an Irish aristocrat and politician and later United Kingdom statesman at the time of the Act of Union.
His family, through his son Richard, became prominent and hereditary members of the Netherlands' nobility.
[1] Among his siblings were Gen. Eyre Power Trench (who married Charlotte, widow of Lady Sir John Burgoyne, 7th Baronet and daughter of James Johnston), Nicholas Power Trench (who married Jane Butler, daughter of Sir Richard Butler, 5th Baronet), and Anne Power Trench (wife of Charles Cobbe, MP, son of Thomas Cobbe and grandson of Charles Cobbe, Archbishop of Dublin).
[3] William was a Member of Parliament in the Irish House of Commons, and supported the Whigs.
William and Anne had nineteen children:[5] Lord Clancarty died on 27 April 1805 at Ballinasloe, Ireland.