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Ilocos Sur was the province that Elpidio Quirino represented as a congressman in the Philippine House of Representatives. Quirino, who later became the sixth president of the Philippines, served as a representative for Ilocos Sur from 1919 to 1925 and again from 1934 to 1945. During his time in the House, he played a significant role in shaping legislation and advocating for the interests of his constituents.