Iarmhumhain was a Kingdom in the early Christian period of Ireland in west Munster. Its ruling dynasty was related to the main ruling dynasty of Munster known as the Eóganachta. Its ruling branch was called the Eóganacht Locha Léin or Ui Chairpri Lúachra. Their center was around Killarney, County Kerry at Loch Léin. The name Iarluachair means west of the Sliabh Luachra mountains.