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John Francis Lemass, better known by his Irish name Seán Lemass, was a prominent Irish political figure who served as Taoiseach (Prime Minister) of Ireland from 1959 to 1966. He was born on July 15, 1899, in Ballybrack, County Dublin. Throughout his career, he played a pivotal role in shaping modern Ireland, driving economic development, social progress, and fostering closer relations with other nations.