As a result of his vast work, he was invited to become a member of several Portuguese academies (Portuguese Academy of History, Lisbon Academy of Sciences, Navy Academy, Geographical Society and Historical Society of the Independence of Portugal) and foreign academies (Academie des Sciences, Inscriptions et Belles Lettres de Toulouse, Brazilian Historical and Geographical Institute (Rio de Janeiro), Brazilian Academy of Letters (Rio de Janeiro), Letters and Arts (São Paulo), Royal Historical Society. University College (London). The significance of his scientific work was also recognised through a number of honorary distinctions, including Commander of the National Order of the Southern Cross (Brazil, 1967), Gold Medal of the City of Santarém (1968), Commander of the Order of Public Instruction (Portugal, 1972), Honorary Medal of the University of Coimbra (2007) and the award of the national prizes Alexandre Herculano Prize (1955), National History Prize (1955); Aboim Sande de Lemos Prize, 1992) and Grand Cross of the Military Order of Santiago da Espada, for Scientific, Literary and Artistic Merit, 2006); and foreign awards (Grand Cross of the Order of Civil Merit of Alfonso X the Wise (Spain, 1995), Prince of Asturias Award for Social Sciences (Spain, 1995). He received honorary doctorates from Paul Valéry University, Montpellier (1974), Complutense University of Madrid (1995), University of Extremadura (2003) and Santarém Polytechnic Institute (2011).

Bibliografia activa: A Infanta D. Maria de Portugal (1521-1577 e a sua fortuna no sul de França. Lisboa: Revista Ocidente, 1955; O Reinado de D. António Prior do Crato, vol. I, (1580-1582). Coimbra, 1956; História Breve da Historiografia Portuguesa. Lisboa: Editorial Verbo, 1962; “Da possibilidade de uma nova “História de Portugal”: Método e Fontes”, in Anais da Academia Portuguesa da História, 1963, pp. 110-137; O Rio de Janeiro no século XVI, vol. I. Estudo Histórico, vol. II, Documentos dos Arquivos Portugueses . Edição da Comissão Nacional das Comemorações do IV Centenário do Rio de Janeiro. Lisboa, 1965; História e Conhecimento Histórico. Lisboa: Editorial Verbo, 1968; A Crónica de Dom João III de António de Castilho. Paris: Arquivos do Centro Cultural Português, vol. II, 1970, pp. 317-403. Publicada posteriormente em Figuras e Caminhos do Renascimento em Portugal. Lisboa: Imprensa Nacional – Casa da Moeda, pp. 169-282; A Historiografia Portuguesa, Séculos XII a XVI, vol. I. Lisboa: Editorial Verbo , 1972; Crónica de Dom João II e Miscelânea por Garcia de Resende . Lisboa: Imprensa Nacional – Casa da Moeda, 1973; A Historiografia Portuguesa, Século XVII, vol. II. Lisboa: Editorial Verbo, 1973; A Historiografia Portuguesa, Século XVIII, vol.

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