Íar mac Dedad was a legendary King of Munster. He is the father, or in some sources more distant ancestor, of Eterscél Mór, and grandfather (or great-grandfather) of the famous Conaire Mór

Conaire Mor

Conaire Mór , son of Eterscél, was, according to medieval Irish legend and historical tradition, a High King of Ireland. His mother was Mess Búachalla, who was either the daughter of Eochu Feidlech and Étaín, or of Eochu Airem and his daughter by Étaín...

, both High Kings of Ireland.

Íar may be the eponymous ancestor of the Érainn of Munster. Both the personal name and tribal name derive from the same root. Among his historical descendants, through the later High King Conaire Cóem, are the Dál Riata

Dál Riata

Dál Riata was a Gaelic overkingdom on the western coast of Scotland with some territory on the northeast coast of Ireland...

 of Ulster

Ulster

Ulster is one of the four provinces of Ireland, located in the north of the island. In ancient Ireland, it was one of the fifths ruled by a "king of over-kings" . Following the Norman invasion of Ireland, the ancient kingdoms were shired into a number of counties for administrative and judicial...

 and Scotland

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

, and the Corcu Duibne

Corcu Duibne

The Corcu Duibne was a notable kingdom in prehistoric and medieval County Kerry, Ireland which included the Dingle Peninsula, the Iveragh Peninsula and connecting lands...

, Múscraige

Múscraige

The Múscraighe were an important Érainn people of Munster, descending from Cairpre Músc, son of Conaire Cóem, a High King of Ireland. Closely related were the Corcu Duibne, Corcu Baiscind, both of Munster, and also the Dál Riata of Ulster and Scotland, all being referred to as the Síl Conairi in...

, and Corcu Baiscind

Corcu Baiscind

The Corcu Baiscind were an early Érainn people or kingdom of what is now southern County Clare in Munster. They descended from Cairpre Baschaín, son of Conaire Cóem, a High King of Ireland. Closely related were the Múscraige and Corcu Duibne, both of Munster, and also the Dál Riata of Ulster and...

 of Munster. These were known as the Síl Conairi

Síl Conairi

The Síl Conairi or "Seed of Conaire" were those Érainn septs of the legendary Clanna Dedad descended from the monarch Conaire Mór, son of Eterscél Mór, a descendant of Deda mac Sin, namely the Dál Riata, Múscraige, Corcu Duibne, and Corcu Baiscinn.The Dál Riata, presumably settling in far...

, one of the principal royal septs of the Érainn.

The brother of Íar was Dáire mac Dedad

Dáire mac Dedad

Dáire mac Dedad is the eponymous ancestor of the Dáirine of Munster and father of the legendary Cú Roí mac Dáire. These further associate him with the prehistoric Darini of Ulster. He is probably identical with Dáire Doimthech , an ancestor of the Corcu Loígde...

, eponymous ancestor of the Dáirine

Dáirine

The Dáirine , later known dynastically as the Corcu Loígde, were the proto-historical rulers of Munster before the rise of the Eóganachta in the 7th century AD. They appear to have derived from the Darini of Ptolemy and to have been related to the Ulaid and Dál Riata of Ulster and Scotland...

. He succeeded Íar as king of Munster.