| Brian O'Neill Brian Ó Néill | |
| Birth Place: | Ulster, Ireland |
| Death Date: | 16 August 1617 (aged 13) |
| Death Place: | Brussels, Spanish Netherlands |
| Burial Place: | St Anthony's College, Leuven |
| Death Cause: | Hanging |
| Noble Family: | O'Neill dynasty |
| Father: | Hugh O'Neill, Earl of Tyrone |
| Mother: | Catherine Magennis |
Brian O'Neill (; – 16 August 1617), also known as Bernard[1] or Con Brian, was a seventeenth-century Irish noble and the youngest son of Hugh O'Neill, Earl of Tyrone. He joined his parents on the Flight of the Earls and was later found dead in Brussels, possibly killed by an English assassin.
Brian O'Neill was the son of Irish lord Hugh O'Neill, Earl of Tyrone, and his fourth wife Catherine Magennis. Tyrone was Chief of the Name of the O'Neill clan, Tír Eoghain's ruling Gaelic Irish noble family.[2] Catherine, Countess of Tyrone, was born into the Magennis family of Rathfriland.
Brian had two full-brothers, Conn and Shane. Born, Brian was Tyrone's youngest son. Shane was born in 1599,[3] and Conn was born . Conversely, the Royal Society of Antiquaries of Ireland claims that Shane was Tyrone's youngest son.
Brian, Shane and their parents took part in the Flight of the Earls, leaving Ireland for mainland Europe in September 1607.[4] Conn could not be located in time, and was left behind in Ireland. As the Irish refugees travelled through Europe, Brian and Shane were left in Leuven in the care of Irish Franciscans. Their parents continued to Rome. The brothers were raised at St Anthony's College in the company of fellow infant nobles Hugh Albert O'Donnell (son of Rory O'Donnell, 1st Earl of Tyrconnell) and Hugh O'Donnell (son of Cathbarr O'Donnell). Brian became a page to Archduke Albert VII.[5]
At 6pm on 16 August 1617, Brian was found dead in his room in Brussels. His death was under suspicious circumstances, as he had been hanged with his hands tied behind his back. At the time, his cause of death was not conclusively proven. Paul Walsh calls Brian's death an "assassinat[ion]". John O'Hart says Brian was "strangled in his bedroom in Brussels... by an English assassin".
Brian was thirteen years old at the time of his death, predeceasing his mother Catherine. His death caused great despair and isolation in his mother, who had lost her husband only the previous year.
Brian was buried in St Anthony's College, Leuven.