Fir Bolg
When the Fir Bolg invaded Ireland the five sons of Dela divided the island amongst themselves. Rudraige landed at "Tracht Rudraige" (Dundrum Bay, County Down) and took Ulster. He and his brother Genann led the portion of the Fir Bolg known as the Fir Domnann, a historical people who were possibly related to the Dumnonii known from Britain and Gaul.