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Male Donnchad MacToirrdelbaig O'Brien Click to view Donnchad MacToirrdelbaig O'Brien in the family tree

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

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