Barry Yelverton, 1st Viscount Avonmore
Barry Yelverton, 1st Viscount Avonmore, PC (Ire) KC (28 May 1736 – 19 August 1805) was an Irish judge and politician, who gave his name to Yelverton's Act 1782, which effectively repealed Poyning's Law. This achievement was destroyed by the Act of Union 1800, which Yelverton supported, gravely damaging his own reputation for integrity, which had already been damaged by the execution of William Orr, widely seen as a miscarriage of justice.
He was the eldest son of Francis Yelverton of Kanturk, County Cork, and Elizabeth Barry of Kilbrin (now Ballyclogh, County Cork) He went to school in Charleville and attended Trinity College Dublin, where he took a degree of Bachelor of Arts in 1757 and of Bachelor of Laws in 1761. His family lacked wealth and social position and he was for some years an assistant master under Andrew Buck in the Hibernian Academy. 
He was returned to the Irish House of Commons as member for Donegal Borough from 1774 to 1776. In that year, Yelverton was elected for Belfast and Carrickfergus.  He chose to sit for the latter and represented the constituency until 1784. Although few examples of his oratory survive, all contemporaries agree on his eloquence, which gave him a dominant position in the Commons.
He became Attorney-General for Ireland in 1782, and was elevated to the bench as Lord Chief Baron of the Exchequer in 1783. He was created Baron Yelverton in 1795, and in 1800 Viscount Avonmore in the Peerage of Ireland. As Chief Baron he led the opposition to the proposal to increase the number of judges in each of the courts of common law from three to four, on the practical ground that four-judge courts often divide evenly and thus cannot reach a decision. Despite this commonsense view, new judges were eventually appointed.
In 1797 he attained a degree of infamy for presiding over what was widely regarded as a show trial which led to the execution of the United Irishman, William Orr (although Yelverton is said to have shed tears when passing the death sentence ). Orr was charged with administering the United Irish oath to a soldier called Wheatly; this had recently become a capital offence. In fact it was generally believed that another man, William McKeever, administered the oath. Wheatly was the only witness for the prosecution, and many believed that he had perjured himself, but despite a superb defence by John Philpott Curran, Orr was found guilty and hanged. Yelverton may have formed an early impression of Orr's guilt and acted on it- even his admirers admitted that as a judge he lacked impartiality.
Peter Finnerty, a journalist, was later convicted of seditious libel for publishing an attack on Yelverton over his conduct of Orr's trial, which did nothing to enhance the judge's reputation.
Among his colleagues at the Irish bar, Yelverton was a popular and charming companion: even John Philpot Curran, despite frequent courtroom clashes, seems to have liked Yelverton personally. They were co-founders of the popular drinking club called The Monks of the Screw. Of insignificant appearance, he owed his early successes to his remarkable eloquence, which made a great impression on his contemporaries; as a judge, he was inclined to take the view of the advocate rather than that of the impartial lawyer.  Ball considered him one of the most learned judges of his time; while Edward Cooke called him "a brute", this simply reflects Cooke's unduly low opinion of all Irish judges. Sir Jonah Barrington wrote that for all his faults it was impossible not to like and respect him.
He gave his support to Henry Grattan and the Whigs during the greater part of his parliamentary career. He was a strong supporter of the demand for an independent Irish Parliament, but later changed his stance.
He played a crucial role in the reforms which are collectively called the Irish Constitution of 1782. In particular he sponsored the Act 21 and 22 of George III, An Act to regulate the manner of passing bills and to prevent delays in summoning of Parliaments- which was popularly known as "Yelverton's Act". This radically modified Poyning's Law of 1495 by which all legislation to be passed by the Irish Parliament had to be drafted by the Privy Council of Ireland, then sent to the English Privy Council for approval. Under Yelverton's Act, the role of the Irish Privy Council was abolished and legislation was commenced in the normal way in the Irish Parliament, which for the last 17 years of its existence enjoyed a wide measure of independence.
Act of Union
In his latter days he became identified with the court party and voted for the Act of Union 1800, for which his viscounty was a reward. For this he was never forgiven by some of his former friends. Sir Jonah Barrington, who continued to regard Yelverton with respect, regretted that this action should have destroyed his reputation forever; but that such a mistake was understandable in a man who lacked worldly wisdom, and despite his good qualities, did not have a strong sense of right or wrong.
He became a member of the Royal Irish Academy in 1787.
He had three sons and one daughter, and the title descended in the family.
Children of Barry Yelverton and Mary Nugent:
- Hon.William Charles Yelverton, 2nd Viscount Avonmore (5 April 1762 – 28 November 1814)
- Hon. Barry Yelverton (22 November 1763 – June 1824)
- Hon. Walter Aglionby Yelverton (26 January 1772 – 3 June 1824), married 1791, Cecilia Yelverton
- Hon. Anna Maria Yelverton (28 September 1775 – 27 April 1865), married 1791, John Bingham, 1st Baron Clanmorris of Newbrook
- Webb, Alfred (1878). " Yelverton, Barry, Viscount Avonmore". A Compendium of Irish Biography. Dublin: M. H. Gill & son. Wikisource
- Chisholm, Hugh, ed. (1911). "Avonmore, Barry Yelverton, 1st Viscount". Encyclopædia Britannica (11th ed.). Cambridge University Press
- Falkiner, Cæsar Litton (1900). "Yelverton, Barry". In Lee, Sidney. Dictionary of National Biography 63. London: Smith, Elder & Co. pp. 314–315.; Endnotes:
- Webb's Compendium; Ryan's Biographia Hibernica, ii. 640
- Wills's Illustrious Irishmen, v. 237
- Barrington's Historic Sketches, and Personal Sketches
- O'Flanagan's Irish Bar, pp. 52–63, and Lives of the Lord Chancellors of Ireland, vol. ii. passim
- Lord Ashbourne's Pitt; Curran's Life, by his Son, i. 118–32
- Phillip's Curran and his Contemporaries, pp. 92–108
- Duhiggs's History of the King's Inns
- Irish Political Characters, 1799
- Smyth's Law Officers of Ireland
- Todd's Graduates of Dublin University
- G. E. C[okayne]'s Complete Peerage
- F. Elrington Ball The Judges in Ireland 1221–1921
|Parliament of Ireland|
|Member of Parliament for Donegal Borough
With: Richard Gore 1774–1776
James Cuffe 1776
Henry Vaughan Brooke
Hon. Henry Skeffington
|Member of Parliament for Belfast
With: Hon. Henry Skeffington
Hon. Henry Skeffington
Conway Richard Dobbs
|Member of Parliament for Carrickfergus
With: Conway Richard Dobbs
Conway Richard Dobbs
|Attorney-General for Ireland
Walter Hussey Burgh
|Lord Chief Baron of the Exchequer for Ireland
|Peerage of Ireland|
|New creation||Viscount Avonmore