As a sign of his scientific vitality and the recognition he received from his peers, the eminent palaeographer and diplomat ist was nominated for various historical and cultural guilds in Portugal and abroad. In Portugal, he was a member of the most active and prominent cultural organisations of the time: Academia das Ciências de Lisboa [Lisbon Academy of Sciences], Sociedade de Geografia de Lisboa [Lisbon Geography Society], Sociedade Portuguesa de Estudos Históricos [Portuguese Society of Historical Studies], Associação dos Arqueólogos Portugueses [Association of Portuguese Archaelogists] and Mutualidade das Bibliotecas e Arquivos de Lisboa [Mutuality of Lisbon Libraries and Archives]. Abroad, he was a corresponding member of the Instituto do Ceará [Ceará Institute] from 1924, at the suggestion of Thomaz Pompeo de Sousa Brasil, Álvaro de Alencar , and Barão de Studart.

Out of all the associations he was involved with, he particularly favoured the Academia das Ciências de Lisboa. He held various positions within it, attending the periodic sessions of the Class of Humanities with almost unblemished regularity. There, he frequently presented papers on various topics, almost always related to H istory. The opinion that approved Pedro de Azevedo ’ s admittance as a corresponding member of the History and Archaeology Section was drawn up at the end of 1910, signed by Henrique da Gama Barros, José Leite de Vasconcelos, Lopes de Mendonça , and José-Ramos Coelho. They formed the jury in charge of assessing a selected set of his publications, which already numbered over a hundred at the time, according to the rapporteur of the case himself. After evaluating the works at hand – Alguns selos antigos do concelho de Santarém [Some old stamps from the municipality of Santarém] (1897), O território de Anegia [The territory of Anegia] (1898), Nomes de pessoas e nomes de lugares [Names of people and names of places] (1900), Um inventário do século XIV [An inventory of the 14 th century] (1902), Os escravos [The slaves] (1903), Os ‘De Vasconcellos’ [The ‘De Vasconcellos’] (1904), Os antepassados do Marquês de Pombal (1905) [The ancestors of the Marquis de Pombal], Dois fragmentos de uma vida de S. Nicolau [Two fragments of a life of St. Nicholas] (1905), As cartas do Pe. António Vieira [The letters of Father António Vieira] (1906) , and Documentos da Secretaria de Guerra [Documents of the Secretary of War] (1906) – and once their quality had been recognised, he was admitted as a corresponding member in January 1911.

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