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Henry MacShane O'Neill (Irish: Anraà mac Seáin Ó Néill; c. 1545-1550 – 1622) was an Irish nobleman and a son of Shane O'Neill. He was the leader of the MacShanes in the late 16th century and early 17th century, and sought control of the O'Neill Clan, fighting with his brother Art against Hugh O'Neill, Earl of Tyrone.