Description: The official site of the International O'Sullivan Clan.
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Welcome to the Clann Ó Súilleabháin Mhumhain, the O’Sullivan Clan of Munster!
(The most senior tribe of the royal Eoghanacht.)
We are a living clan with over 1800 active members, tens of thousands extended members, a functioning derbhfine, a castle seat, and a hereditary chief of the name. Most of us enjoy a bond of common blood and all of us share an affection for our name, O’Sullivan / Sullivan.