The Lordship of Coshmaing is an historic honorific title associated with the Gaelic nobility of Ireland. The title was created in the 14th century when the then King of Desmond, granted an appanage (estate and title) to one of his sons. As with other such titles in Ireland, it no-longer has any recognition under the law, and has not been used for several hundred years.
As a republic, the Constitution of Ireland prohibits the conferring of "titles of nobility" by the state. However, groups such as the Standing Council of Irish Chiefs and Chieftains have attempted to raise awareness of the Irish titles of nobility as used in Gaelic Ireland. While some titles had obtained "courtesy recognition" by the Chief Herald of Ireland, this practice was discontinued by 2003 when the Attorney General noted that such recognitions were unconstitutional and without basis in law.
As "incorporeal hereditaments", any lands which may have historically related to such a title and long since disassociated from these (now) honorific titles - and such titles no longer attach to any territories.
The Lordship of Coshmaing (also spelled variously as "Cosmaigne," "Coshmang," "Cois Mainge," etc.) was created in the 14th century when the King of Desmond, Cormac MacCarthy Mór (d. 1359), granted an appanage to his third son, Eoghan. (NB: His second son, Diarmud, was granted the appanage of the Lordship of Muskerry.) Thus established the family/sept of Sliocht Eoghan (Owen) Mór of Coshmaing, which was located in today's County Kerry, Ireland, Barony of Magunihy, Province of Munster (see map).