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In page Seán Lester:

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He was born in County Antrim, the son of a Protestant grocer. Despite the fact that the town of Carrickfergus, where he was born and raised, was strongly Unionist, he joined the Gaelic League as a youth, and was won over to the cause of Irish nationalism.[1] As a young man he joined the Irish Republican Brotherhood. He was working as a journalist for the North Down Herald and a number of other northern papers, before moving to Dublin, where he found a job with the Freeman's Journal. There, by 1919, he had risen to news editor.