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eallachan (Callahan, Callaghan, Cellachan, Ceallaghan, Cellachain,Ceallachain) of Cashel (Caisal, Caisil), was the 10th century King of the Irish province of Munster (i.e. the southwestern quarter of Ireland) from whom the family names of Callahan and MacCarthy and their variations (e.g. Callaghan, O'Callahan, O'Callaghan, MacCarthaig, etc.) were derived. This website makes available historical sources and written accounts about his life and legacy including the Irish Medieval Saga of Ceallachan of Cashel, the various Irish Annals, and The Circuit of Ireland.

Right: Drawing by Eudora Sellner. A typical woman's dress in northwestern Europe during the 9th and 10th century.


  • Home Page
  • Frequently asked questions (FAQ's)
  • Genealogical Information and the Inauguration Ceremony of Ceallachan c. 940/44 A.D
  • Historical Context
  • Maps and 3D Computer animation
  • Geoffrey Keating's, History of Ireland
  • The Medieval Irish Saga of Ceallachan
  • The Irish Annals
  • The Circuit of Ireland
  • References / Bibliography
  • Links
  • Contact information