O'Driscoll (and its derivative Driscoll) is an Irish surname stemming from the Gaelic Ó hEidirsceoil clan. The O'Driscolls were rulers of the Dáirine sept of the Corcu Loígde until the early modern period. Their ancestors were Kings of Munster until the rise of the Eóganachta in the 7th century. At the start of the 13th century, three prominent branches of the family came into existence: O'Driscoll Mor, O'Driscoll Og, and O'Driscoll Beara. The Ó prefix was dropped by many in Ireland during the 17th and 18th centuries. The surname is now most prominent in the Irish counties of Cork and Kerry. Naming conventions Overview The surname derives from the forename Eidirsceol, who was alive in the early-to-mid 10th century. The Irish word itself, eidirsceol, means "go-between" or "bearer of news". The family are of Érainn, descent, specifically the Corcu Loígde population group. By the time the family began using the surname, the territory known as Corcu Loígde (roughly the same as the diocese of Ross) in south-west County Cork, was identified as their homeland, with the town of Baltimore been their seat. From the 12th century the Ó hEidirsceoil's were recorded as kings of Corcu Loígde. Been driven so far south by the Gaelic Eóganachta and the Anglo-Normans, the family became expert sailors and fishermen. According to John Grenham: From the thirteenth to the fifteenth centuries they struck an alliance with the Powers of County Waterford in their long feud with the burgesses and merchants of Waterford city, and many of their leaders were killed in battle on land and sea. The feud ended when one of the best known incidents occurred in 1413, when the Mayor of Waterford, Simon Wicken, arrived in Baltimore on Christmas Day and was invited to join in the Christmas festivities. From the fifteenth century on, the family struggled to retain lands and power taken by the English. By 1610, Baltimore had become an English port. In 1631 the town was sacked by Algerine pirates who according to the Irish poem, "Only Smiled; O'Driscolls Child", the pirates burned, raided and kidnapped their people. The poem describes a brave O'Driscoll girl who fought back against the pirates. The poem further describes that, "High on a gallows tree a yelling wretch is seen: Hackett of Dungarvan steered the Algerine". "Some mutter'd of MacMurchadh who brought the Norman O'er. Some curs'd him with Iscariot, that day in Baltimore!"