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Male William O'Brien Click to view William O'Brien in the family tree

William was born in 1666.  William's father was William O'Brien and his mother is Margaret Boyle.  His paternal grandparents were Murchadh O'Brien and Elizabeth Saint Leger; his maternal grandparents were Roger Boyle and Margaret Howard.  He was an only child.  He died at the age of 53 on December 24th, 1719 in Cloyne Cathedral.


William's first family with Mary Villiers

‌William and Mary were married in a religious ceremony in April 1691.  They had three sons named William, Charles and James.


William's second family with Margaret O'Brien

They had a daughter named Mary.


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