The Gaelic-Irish Lordship of Molahiffe (Irish: Magh ui Fhlaithimh) was created in the 14th century by Eóghan (Owen) Mór MacCarthy, Lord of Coshmaing, as a grant to his son, Donal.
Although, in the present day, no territory attaches to the title of Lord (Baron) of Molahiffe, it was, in the 14th-century, located in the Kingdom of Desmond, in modern-day County Kerry, Barony of Magunihy.
The northern boundary of the Lordship of Molahiffe (as well as the Kingdom of Desmond, Coshmaing, and the Barony of Magunihy) was the River Maine, which flows into Dingle Bay at Castlemaine Harbor.
The area of Molahiffe projecting to the north of the River Maine (Maing) extended to the ridgeline of the Slieve Mish mountain range,[5] which partly bisects the Dingle Peninsula.
Thus, the title of the Lord (Tiarna) of Molahiffe re-vested, as of 1824, with the Paramount Lordship of Cosmaigne, which, in turn, is dependant from the Royal House of MacCarthy Mór.