The Irish surname Costello owes it's origin to the Norman family, the Nangles, who came to Ireland during the Norman Invasion of the twelfth century, meaning "sons of Oisdealb", who was himself the son of the celebrated Gilbert de Nangle. The Costellos are described in the"Annals of the Four Masters" as the sons of Oisdealb". This family held lands in County Mayo, in the barony of Costello (named for them), in the east of that county, until the end of the sixteenth century. In 1565, their principal seat was in Ballaghadereen. The feuding between the Costellos and their neighbors the MacDermots, gave rise to many a tale, none more moving, perhaps, than the tragic love story of Una MacDermot, daughter of the last chief of that name, and the son of the chieftain MacCostello; they now lie in adjoining graves in Trinity.
This family also produced a well -known reparee ( a wild Irish rebel, so called for his being armed with a repaire, orhalf-pike), Dubhaltach Costello, who, after failing to recover his family estates, devoted his life to wreaking vengeance on the new Cromwellian proprietors. A noble bearer of this name is John A. Costello who held the post of Taoiseach, or Prime Minister, of Ireland from 1948-1951 and again from1954-1957.
Blazon Of Arms: Or, three lozenges gules.
Translation: The lozenge is held to be a sign of noble birth. The color gules (red) denotes military fortitude, the color Or (gold) depicts generosity.
Crest: A falcon proper belled or.
Translation: The falcon denotes one who is eager in pursuit of his objective.
Motto: Ne te quae siveris extra.
Translation: Do not seek thyself outside of thyself.
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