Both Imokilly and the adjacent barony of
Barrymore formed the
early medieval kingdom of the
Uí Liatháin which was awarded to the
Cambro-Norman De Barry family by King
John of England in 1206. Its name derives from the Gaelic name of the most powerful septs in the ancient kingdom - the
Uí Meic Caille and the
Uí Thassaig. In 1420,
James FitzGerald, 6th Earl of Desmond was made
Seneschal of the barony. The
Earls of Desmond continued to appoint their
FitzGerald cousins to the office. As a result of their participation on the losing side of the
Desmond Rebellions, their lands and offices were forfeit to the Crown. Subsequently,
Baron Ponsonby of Imokilly was a title in the
Peerage of the United Kingdom. == Civil parishes ==