Matthew O'Neill, 1st Baron Dungannon, was an Irish aristocrat born around 1510 as the natural son of Conn O'Neill, the Earl of Tyrone. Under the surrender and regrant policy introduced during the reign of Henry VIII, Matthew was in October 1542 confirmed as his father's heir and created Baron of Dungannon, with both father and son travelling to London to formally submit to the Crown. This arrangement made Matthew the designated successor to the Earldom of Tyrone, placing him at the centre of a fierce succession dispute within the O'Neill dynasty.
The arrangement was fiercely contested by Matthew's legitimate half-brother Shane O'Neill, who commanded a larger and more powerful following and rejected the English-imposed succession. Shane's violent response crushed the government's hope for a peaceful transition of the earldom. In 1558, Matthew was killed by Shane's men, the sources describing it as an assassination carried out by some of Shane's supporters. In the aftermath, the English statesman Sir Henry Sidney organised the retrieval of Matthew's sons Brian and Hugh, who stayed for a time at Sidney's Dublin residence, ensuring the continuation of the MacBaron branch of the O'Neill family against Shane's MacShane faction.
Shane subsequently attempted to delegitimise Matthew's claims entirely, arguing before the Crown that Matthew's true father was not Conn O'Neill but a blacksmith named Kelly from Dundalk. Shane sought to undermine Matthew's standing under both English primogeniture and Gaelic custom. Despite receiving some recognition of his role as head of the O'Neills, Shane was never granted the earldom, and he was himself killed by the MacDonnells of Antrim in 1567.
Matthew's murder in 1558 was carried out by Shane O'Neill's men, ending the life of the Crown's chosen heir to the Earldom of Tyrone; in the immediate aftermath, Sir Henry Sidney moved swiftly to secure Matthew's sons Brian and Hugh, bringing them to his Dublin residence to protect what remained of the government's preferred line of succession against Shane's dominant faction.
Matthew O'Neill, 1st Baron Dungannon, killed
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