The most famous, Oisin in Tir na nOg belongs to the Fenian Cycle, but several free-standing adventures survive, including The Adventure of Conle, The Adventure of Bran mac Ferbail and The Adventure of Laegaire.
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When the Irish hero, Oisin, is taken to the Land of Youth, he sees himself mounted on a white horse, pursuing a beautiful girl on a dark horse who bears in her hand a golden apple.