Poet of the Fianna
Oisín was the son of Fionn mac Cumhaill and the poet of the Fianna. His mother was Sadhbh, a woman transformed into a deer by the Dark Druid. He was born in deer form on the slopes of Ben Bulben, found by his father while hunting, and raised human. His name means “little fawn.” His mother was taken back by the Dark Druid while Fionn was away and was never found.
He was the Fianna’s poet — the warrior who composed verse, who kept the memory of the heroic age, who would be its last voice.
Niamh of the Golden Hair came to him from the sea on a white horse and invited him to Tír na nÓg, the Land of Eternal Youth. He went. Three hundred years passed there as what felt like three years. He grew homesick and asked to go back to Ireland. Niamh gave him the white horse and one warning: if his feet touched Irish ground, he could not return.
He arrived in Ireland and found the Fianna gone and Emain Macha in ruins. He stopped to help some men move a stone. The saddle girth broke. He fell. Three hundred years collapsed onto him in moments. Saint Patrick found him — an ancient blind man, the last of the Fianna, with nothing left of his world but his voice.
The conversations between Oisín and Patrick are among the most celebrated exchanges in Irish literature. Oisín does not convert. He mourns the Fianna, argues for the dignity of their world, and refuses to accept that his companions are in hell. Patrick offers heaven. Oisín wants the Fianna back. The argument is never resolved — both voices are left intact.
He and Caílte mac Rónáin are the two survivors who told the stories of the Fianna to Patrick’s scribes — the Acallam na Senórach, the Colloquy of the Old Men — preserving what would otherwise have been lost. His son was Oscar, the greatest warrior of the later Fianna.
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