- Born circa 1540
- Deceased on July 20, 1616 in Rome, at the approximate age of 75 years
Parents
- Matthew O'Neill, Feardorcha Ó Néill (c. 1520 - 1558), Baron of Dungannon
- Joan Maguire
Family
- Married with Katherine O'Neill, divorced in 1574
- Married with Joanna O'Donnell, Siobhân O'Donnell ( - 1591)
- Married on July 3, 1591, with Mabel Bagenal, l'Hélène de Troie des guerres élisabéthaines (c. 1571 - 1595)
- Married with Katherine Magennis ( - 1618), issuing
- Shane (1599 - c. 1653)