Sean Dubh Mac Coisdealbhaigh
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Sean Dubh Mac Coisdealbhaigh, Lord of Sliabh Lugha and Chief of the Name, died 1487.
Under the year 1487, the Annals of Lough Cé state that "Mac Goisdelbh, i.e. John, died."
The Annals of the Four Masters however give a more detailed account, stating that "John Duv Mac Costello, Lord of Sliabh-Lugha, died; and two lords were set up in his place, namely, William, the son of Edmond of the Plain, his own brother, and Jordan, the son of Philip Mac Costello."
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