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The old kingdoms are indicated by blue lettering. The baronies (also showing older territories) are in white.
Surnames, in their commonly used forms, are shown in black. Each name has a long association with the locality shown, during either the medieval period or in more recent times. In some cases different septs using the same surname arose in widely different areas. In other cases migration due to war dispersed them.

In Gaelic times County Kerry was known as Iarmumu. The O'Connor Kerry held the north, the O'Moriaritys held the central parts, and the southern portion was occupied by the O'Sullivans, O'Donoghues and O'Mahonys. From the 14th century the Norman Fitzgeralds and the MacCarthys ruled while the O'Sullivans and their kinsmen the MacGillicuddys remained prominent.

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