Áedán mac Gabráin
The best record of any event before the incursions of the Northmen is attributed to Báetán mac Cairill, king of Ulster, who (according to the "Annals of Ulster") led an expedition to Man in 577–578, imposing his authority on the island (though some have thought this event may refer to Manau Gododdin between the Firths of Clyde and Forth, rather than the Isle of Man). After Báetán's death in 581, his rival Áedán mac Gabráin, king of Dál Riata, is said to have taken the island in 582.