The Milesians or sons of Míl are the final race to settle in Ireland, according to In the Lebor Gabála Érenn, a medieval Irish Christian pseudo-history. The Milesians represent the Irish people. The Milesians are Gaels who sail to Ireland from Iberia (Hispania) after spending hundreds of years travelling the earth. When they land in Ireland they contend with the Tuatha Dé Danann, who represent the Irish pantheon of gods. The two groups agree to divide Ireland between them: the Milesians take the world above, while the Tuath Dé take the world below.

Ireland is an island in the North Atlantic Ocean, in north-western Europe. It is separated from Great Britain to its east by the North Channel, the Irish Sea, and St George's Channel. Ireland is the second-largest island of the British Isles, the third-largest in Europe, and the twentieth-largest in the world.