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Liam Cosgrave was the full name of the Irish politician who served as Taoiseach (Prime Minister) from 1973 to 1977. He was the son of former Taoiseach W.T. Cosgrave and a member of the Fine Gael party. Cosgrave's tenure as Taoiseach was marked by economic challenges and political instability, including the outbreak of the Troubles in Northern Ireland.