Finvarra was one of the ancient Tuatha de Danann who descended into the hills. He lorded over Galway from Knockma, near Tuam.
Description
Lady Wilde describes him as "a grand, grave gentleman all in black." In one Irish legend, that of Ethna the Bride he is described as a kidnapper of young mortal women.
Says Lady Wilde:
"Finvarra, the king of the fairies of the west, keeps up the most friendly relations with most of the best families of Galway, especially with the Kirwans of Castle Hacket, for Finvarra is a gentleman, every inch of him, and the Kirwans always leave out kegs of wine for him at night of the best Spanish wine. And in return, it is said, the wine vaults at Castle Hacket are never empty, though the wine flows freely for all comers."
Sources
Ancient Legends of Ireland by Lady Wilde.