The Ui Neill dynasty split into two septs, the Northern Ui Neill and the Southern Ui Neill, around 400 A.D. Owen Roe O’Neill organized the return of 300 Irish officers in the Spanish service to Ireland to support the Irish Rebellion of 1641, which was led by Felim O’Neill of Kinard (Phelim O’Neill). Jonjo O’Neill is a well-known Irish jockey and trainer, Martin O’Neill has managed Scotland’s Celtic football club to huge success in recent years, and baseball player Paul O’Neill made a name for himself with the New York Yankees.