Inis Clothrann: Inishcloghran in Loch Ree, County Longford
Innbir Scene: the mouth of Waterford Harbour near Tramore; or the mouth of Kenmare Bay, in the County Kerry
Inncoin: the Dungolman, a river into which the Inny flows and which divides the barony of Kilkenny West from Rathconrath, in the County Westmeath
Iraird Cuillinn: a height south of Emain Macha, in Ulster
Irrus Domnann: the barony of Erris, in County Mayo: the clan which bore this name and to which Ferdiad belonged was one of the three heroic races of ancient Ireland
Laeg: son of Riangabair and Cuchulain's faithful charioteer (pronounced Lay)
Latharne: Larne, in the County Antrim
Lebarcham: a sorceress
Leire: in the territory of the Fir Roiss, in the south of the County Antrim