Hugh O'Neill, 1st Baron Rathcavan
Robert William Hugh O' Neill, 1st Baron Rathcavan,( 8 June 1883 – 28 November 1982), known as Sir Hugh O' Neill, Bt, from 1929 to 1953, was an Ulster Unionist member of both the Parliament of the United Kingdom and the Parliament of Northern Ireland.
Obata Toramori
He was the father of Obata Masamori.
Lars Eliasson
He is the father of the later Member of Parliament Anna Eliasson.
Brian O'Neill, Baron Dungannon
Brian Ó Néill, Baron Dungannon( died 18 April 1562) was an Irish aristocrat of the Elizabethan era.
He was part of the O' Neill dynasty, a powerful Gaelic family in Ulster.
Brian's father was Matthew O'Neill, 1st Baron Dungannon who had been given his title by Henry VIII as part of the surrender and regrant policy.
Matthew was assassinated by his half- brother and rival Shane O'Neill in 1558.
Shane tried to have the government recognise Matthew and his sons as illegitimate, but they continued to be supported by the Viceroy the Earl of Sussex in Dublin.
In 1562 Shane and Brian were ordered to attend the Court in London to present their cases to Elizabeth I and her ministers.
Shane came to London, but while Brian was travelling from Newry to Carlingford he was assassinated by Turlough Luineach O' Neill, almost certainly on the orders of Shane.
While Shane made a melodramatic submission to the Queen in London, she only partly accepted his claims.
Despite being acknowledged as the most powerful Ó Néill, he was not made an Earl as he had wished.
Shane was himself assassinated five years later by the MacDonnells of Antrim.
Brian was succeeded by his younger brother Hugh who eventually became Earl of Tyrone and head of the Ó Néills.
His other brothers were Cormac and Arthur.
In Gaelic form he is often known as Brian mac Baron Ó Néill.
Brian MacArt O'Neill
Brian MacArt O' Neill was a member of the O' Neill Dynasty, the leading Gaelic family of Ulster.
He was the son and heir of Art MacBaron O'Neill of Oneilland and a grandson of Matthew O'Neill, 1st Baron Dungannon.
He may have taken part in Tyrone's Rebellion, a conflict in which several of his brothers were killed.
Along with the rest of his family he was pardoned as part of the Treaty of Mellifont in 1603.
In 1607 he was arrested on a charge of murder.
Because it was unlikely that a jury in County Armagh, where many people remained frightened of the O'Neills, would convict him it was decided to try him in Dublin instead.
Despite attempts by his powerful and influential uncle Hugh O'Neill, Earl of Tyrone to have him pardoned the sentence was still set to be carried out.
Tyrone reportedly offered a bribe of £ 500 to secure his release, which was refused.
The steadfast refusal of the Viceroy of Ireland Sir Arthur Chichester to overturn the death sentence, convinced Tyrone that his power was being weakened despite his generally good relations with James I in London.
This was a factor in his decision to take part in the Flight of the Earls which took him into exile in Italy.
The Earl's departure sealed the fate of Brian who was hanged on the reduced charge of manslaughter.
Three of his brothers served as mercenaries in the Spanish Army.
The best- known of them was Owen Roe O'Neill.
Matthew Ó Néill, 1st Baron Dungannon
Matthew Ó Néill, 1st Baron Dungannon (alias "Matthew Kelly", alias "Feardorcha Ó Néill")
(1520 – 1558) was an Irish aristocrat.
He was accepted by Conn O'Neill as his natural son.
Matthew was challenged by his alleged half-brother Shane O'Neill over who had the right to succeed as Earl of Tyrone.
William O'Neill, 1st Baron O'Neill
Reverend William O'Neill, 1st Baron O'Neill (4 March 1813 – 18 April 1883) was an Anglo-Irish hereditary peer, clergyman and musical composer.
Born William Chichester, he changed his surname to O'Neill in 1855.
Eoin O'Gallagher
Sir Eoin O'Gallagher was an influential Irish figure in the Gaelic lordship of Tyrconnell during the Elizabethan era.
He was head of the O' Gallagher family, and the chief advisor to the O'Donnell dynasty who ruled Tyrconnell.
He was the son of Tuathal Balbh O' Gallagher( a previous renowned chief of his name).
He came to prominence during the rule of Sir Hugh O'Donnell.
His good relationship with the Crown is shown by his being awarded an annual pension in 1574 and a knighthood in 1581.
He married the widow of Matthew O'Neill, 1st Baron Dungannon who had been assassinated in 1558, and therefore became stepfather to Hugh O'Neill, Earl of Tyrone and his brothers Cormac and Art.
During the long O'Donnell succession dispute in the 1580s and 1590s he backed Hugh Roe O'Donnell, who eventually triumphed and was acknowledged by the Crown.
Yasuichi Oshima
He is the father of manga artist Towa Oshima.
Shane O'Neill (Irish chieftain)
Shane O'Neill (c. 1530 – 2 June 1567), was an Irish chieftain of the O'Neill dynasty of Ulster in the mid 16th century.
Shane O'Neill's career was marked by his ambition to be The O'Neill – sovereign of the dominant O'Neill family of Tír Eoghain—and thus overlord of the entire province.
This brought him into conflict with competing branches of the O'Neill family and with the English government in Ireland, who recognised a rival claim.
Shanes's support was considered worth gaining by the English even during the lifetime of his father Conn O'Neill, 1st Earl of Tyrone (died 1559).
But rejecting overtures from Thomas Radclyffe, 3rd Earl of Sussex, the lord deputy from 1556, Shane refused to help the English against the Scottish settlers on the coast of Antrim, allying himself instead with the MacDonnells, the most powerful of these immigrants.

Question: Who is the father of Matthew Ó Néill, 1St Baron Dungannon?