The deeds of Finn Mac Cool take place in and near Killarney, a town on Ireland's southwest coast; Dublin, a mid-coast port on the island's eastern shore; and other regions of southern and central Ireland. Although Finn and his men are human heroes, they often receive supernatural aid in the form of fairy magic and Druid spells. They live in a time out of mind, although their deeds become enmeshed with the invasions of the Norsemen, who are representative of all of Ireland's invaders. It is the mission of the Fianna, the celebrated Warrior Brotherhood, to protect the land from foreign invasion and to maintain internal peace and brotherhood. Finn Mac Cool is the greatest hero ever to become captain of the Fianna.