Suzanne

Sorry about that! The Shorter Oxford says:

Milesian : Of or pertaining to Milesius, a mythical Spanish king whose sons were said to have conquered the ancient kingdom of Ireland about 1300 BC, or his people; Irish. L16.B n. A member of the people descended from the companions of Milesius; an Irish person. L17.

It was used as a poetic term for Irish throgh the last century.

Regards