1403 in Ireland

Events from the year 1403 in Ireland.

Incumbent

 * Lord: Henry IV

Events

 * Tadhg Ruadh Ó Cellaigh succeeded Conchobar an Abaidh Ó Cellaigh as King of Hy-Many in present-day counties Galway and Roscommon.
 * Maolmhordha mac Con Connacht succeeds Giolla Iosa mac Pilib, as King of East Breifne, in present-day counties Leitrim and Cavan.
 * The Garter, an ornament attached to the Great Sword of State of Dublin, was presented to the citizens of Dublin in 1403 by King Henry IV.
 * Laurence Merbury took the role as deputy to Lord Chancellor Thomas Cranley when the latter could not work due to old age.
 * Thomas Bache was appointed as the Chief Baron of the Irish Exchequer, and granted letters of protection by Henry IV.
 * Robert Sutton was appointed as the Deputy Treasurer of Ireland.
 * Stephen de Bray, then Lord Chief Justice of Ireland, was granted the power to issue writs of novel disseisin.
 * Mac Raith Ó hEidirsgeóil was replaced by Stepehn Brown as the new Bishop of Ross.

Arts and literature

 * Nicholas Ó hÍceadha and Boulger O'Callahan wrote a commentary on the Aphorisms of Hippocrates.

Deaths

 * Conchobar an Abaidh Ó Cellaigh, king of Hy-Many (birth date unknown)