Peter O'Brien, 1st Baron O'Brien

Peter O'Brien, 1st Baron O'Brien, PC, QC (29 June 1842 – 7 September 1914), known as Sir Peter O'Brien, Bt, between 1891 and 1900, was an Irish lawyer and judge. He served as Lord Chief Justice of Ireland between 1889 and 1913. In his lifetime he was universally known as Peter the Packer, due to the skill he displayed as Attorney-General in securing verdicts by packed juries.

Background and education O'Brien was born at Carnelly House, Clarecastle, County Clare, the fifth son of John O'Brien, Liberal Member of Parliament for Limerick, and his wife Ellen Murphy, daughter of Jeremiah Murphy of Hyde Park, County Cork. He was a nephew of Mr. Justice James O'Brien of the Court of King's Bench (Ireland). He was educated at Clongowes Wood College and Trinity College Dublin and was called to the Irish Bar in 1865.

He was one of the principal prosecutors in the Phoenix Park murders, and it is said that his life was threatened as a result. He unsuccessfully stood for the House of Commons as the Liberal candidate for County Clare in 1879: his defeat is said to have been due to his opposition to Irish Home Rule. which stuck to him all his life.

Opinions on his judicial ability vary. A. M. Sullivan wrote that as a pupil of the great Chief Baron Christopher Palles he must have learned the principles of common law but, though intelligent, he was generally too lazy to apply them. Palles himself is said to have remarked of one of O'Brien's judgments "you never learned that law from me!". However, his judgement in R. (Bridgeman) v. Drury 2 I.R. 489 where he refused to allow the members of Dublin Corporation to charge the ratepayers of Dublin for a particularly lavish picnic, is still often quoted both for its legal principle and its remarkable wit and humour. His judgment in Ussher v. Ussher (1912), on whether a marriage conducted according to the Roman Catholic rite can be valid if there is only one witness to it, has also been praised as "careful and erudite." He was notoriously susceptible to female charms: it was said that a pretty young lady was generally treated as a conclusive witness for whichever side she appeared.

O'Brien was created a Baronet, of Merrion Square in the County of the City of Dublin, on 28 September 1891, and was ennobled as Baron O'Brien, of Kilfenora in the County of Clare, in 1900.

Personal life Lord O'Brien married Annie Clarke, daughter of Robert Hare Clarke of Bansha Castle, County Tipperary, and his second wife Anne Butler in 1867 and had three children: James, who died young, Ellen (who died in 1930) and Anne Georgina.

Lord O'Brien also had an Irish mistress, based in London, called Mary McNally with whom he separately had 4 children, who went by the name of Blake.

His only legitimate son having predeceased him, he died without male heirs at Airfield, Stillorgan, County Dublin, on 7 September 1914, his barony and baronetcy thus becoming extinct.

His daughter, Annie Georgina O'Brien, published an affectionate memoir of her father a few years after his death. His main personal foibles were his refusal to wear the judicial wig, and a lisp so pronounced that it often made his remarks from the Bench difficult to follow.

Maurice Healy in his own memoir The Old Munster Circuit described O'Brien as a man of considerable legal ability and great natural kindness, who was deservedly very popular. On the other hand, he was rather vain and self-important, and inclined to stand on the dignity of his office.

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