In Irish mythology, a leprechaun is a type of male faerie said to inhabit the island of Ireland. They are a class of "faerie folk" associated in Irish mythology and folklore, as with all faeries, with the Tuatha Dé Danann and other quasi-historical races said to have inhabited Ireland before the arrival of the Celts. Leprechauns and other creatures of Irish mythology are often associated with "faerie forts" or "faerie rings" — often the sites of ancient earthworks or drumlins. They are said to be very rich, having many treasure crocks buried during war-time. According to legend, if anyone keeps an eye fixed upon one, he cannot escape, but the moment the eye is withdrawn he vanishes.