Sidhe (Aos Sí)
The supernatural race of Irish folklore - the people of the fairy mounds. The aos sí (pronounced 'ees shee') descend directly from the Tuatha Dé Danann, the divine 'People of the Goddess Danu' who ruled Ireland in pre-mortal times. According to the Lebor Gabála Érenn (Book of Invasions), when the Milesians conquered the Tuatha Dé Danann, they retreated underground into great burial mounds, hollow hills, and ancient forts—becoming the aos sí, the 'hidden people.' The Otherworld (Tir na nÓg, 'Land of Youth') is accessible through the sídhe—ancient burial mounds, passage tombs like Brú na Bóinne,