Bernard Dunne's Mythical Heroes

Oisín & Niamh (1x6)

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Oisín, son of Fionn MacCumhaill, fell in love with beautiful Niamh and travelled to the magical Tír na nÓg with her. After what he thought was 3 years he returned to Ireland to discover that it had in fact been 300 years – all that he had known had disappeared and a new Christian Ireland had taken its place.