Events from the year 1404 in Ireland.

Incumbent Lord: Henry IV

Deaths Flann Óc mac Séoan Ó Domhnalláin was Ollamh Síol Muireadaigh John Colton, Archbishop of Armagh John Keppock, a judge of the late fourteenth century, who held the offices of Lord Chief Justice of Ireland and Chief Baron of the Irish Exchequer.

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