This is a short history of the O''Callaghan clan I have put together from various sources.
952 Ceallachain, King Of Munster dies.
1000 Internal strife among Ceallachain's descendants
1121 McCarthys become dominant
1300 Settle in Pobul-I-Callaghan near Mallow.
1520 Battle of Mourne Abbey.
1568 Teige Roe, Chief of O'Callaghans killed at battle of Lixnaw
1594 Surrender of lands to Queen Elizabeth I and regrant of lands from the
Queen. End of the Clan way of life.
1641 Donnacha O'Callaghan supports Confederate rebellion
1643 17 O'Callaghans declared outlaws
1652 Ceallachain O'Ceallachain signatory to Confederate surrender.
1659 Donnchad O'Callaghan & 19 other families transplanted to County Clare.
1678 Confiscated lands in Clonmeen acquired by Sir Richard Kyrle
1690 Donogh O'Callaghan of Clonmeen, Co. Cork and Donogh O'Callaghan of Mountallon, Co. Clare outlawed for supporting Jacobite rebellion.
1944 Don Juan O'Callaghan of Tortosa, Spain recognised by the Irish
Genealogical Office as "The O'Callaghan", the chief of the clan.
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