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Castleknock, Dublin, is the birthplace of Liam Cosgrave, a prominent Irish politician who served as Taoiseach (Prime Minister) from 1973 to 1977. Cosgrave was born into a political family, with his father, William T. Cosgrave, also serving as Taoiseach. He played a significant role in Irish politics, leading the Fine Gael party and implementing various economic and social policies during his tenure as Taoiseach.