1403 in Ireland

Events from the year 1403 in Ireland.

Incumbent

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.

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