He was born in the year 1499 in Antrim, Antrim, Ireland.Source 2
He died on April 1, 1553 in Clare, Ireland, he was 54 years old.Source 2
Alternative: He died on April 1, 1553 in Murdered at Clonroad, Ennis, County Clare, Ireland, died from wounds received in a skirmish with followers of his brothers, Sir Donal and Turlough, he was 54 years old.
When copying data from this family tree, please include a reference to the origin: Pam Schaeffer Massung, "Schaeffer-Massung Family Tree", database, Genealogy Online (https://www.genealogieonline.nl/schaeffer-massung-family-tree/I280145793259.php : accessed April 30, 2025), "Donnchadh O'BRIEN 🟢 2nd Earl Thomond (1499-1553)".
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