Dermod McMurrough O'Brien was the 2nd Baron Inchiquin. He was the son of Murrough O'Brien, 1st Earl of Thomond and Eleanor FitzGerald. O'Brien married Margaret O'Brien, daughter of Donough O'Brien, 2nd Earl of Thomond.
- Citizenship
- Kingdom of Ireland
- Born
- 1550
- Died
- May 1, 1557