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Male Diarmait O'Brien of Munster Click to view Diarmait O'Brien of Munster in the family tree

Diarmait O'Brien of's father was Toirrdelbach O'Brien of Munster.  His paternal grandfather was Teige (Terence) O'Brien. He had three brothers named Muirchertach II O'Brien of, Tadg O'Brien of and Donnchad MacToirrdelbaig.

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