He was one of the founders of the then Popular Democratic Party together with Francisco Sá Carneiro, Francisco Pinto Balsemão, Joaquim Magalhães Mota, Carlos Mota Pinto, João Bosco Mota Amaral, Alberto João Jardim and António Marques Mendes, in which party he exercised many offices at its national organs.
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He was also a member of the Portuguese Council of State as the President of the Assembly of the Republic during the same period.
Present at the ceremony were representatives of various European royal and noble houses, President of the Republic Aníbal Cavaco Silva, Prime Minister Mário Soares, and President of the Assembly António Barbosa de Melo, among others.
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