During his research in the Portuguese archives, Hermann Kellenbenz met Virgínia Rau, founder of the Centro de Estudos Históricos ( Instituto de Alta Cultura ) [Centre for Historical Studies (Institute of High Culture)], an attachment of the Faculty of Letters of the University of Lisbon, in 1958. At the same time, A.H. de Oliveira Marques—a student of Virgínia Rau at the Faculty of Letters—was studying the economic relations between Portugal and the Hanseatic League during the Middle Ages. He spent one year studying at the University of Würzburg, where Kellenbenz was professor of history. He supervised Oliveira Marques' thesis on German archives and libraries, and they developed a friendship that lasted until Kellenbenz's death. As a result of his acquaintance and contact with the Portuguese scientific community, Kellenbenz took part in the IV Colóquio Internacional de Estudos Luso-Brasileiros: relações culturais, identidade e interlocução [4th International Colloquium of Luso-Brazilian Studies: cultural relations, identity and interlocution] in 1959 in the city of Salvador da Bahia. At the same conference, relations intensified between the German historian and his Portuguese colleagues, Joel Serrão, Joaquim Veríssimo Serrão and Luís de Matos. During the 1960s, H. Kellenbenz was a professor of economic and social history at the University of Cologne and, at the same time, the director of the Economic Archives of the Rhineland-Westphalia region (Cologne): Rheinisch-Westpfälisches Wirtschaftsarchiv . During this period, he also set up a research centre at the University of Cologne, called the "Kölner Forschungsinstitut" (Cologne University Research Institute). Continuing to investigate the economic relations between Germany and Portugal (and Brazil), the countless results of his research in world archives originated publications such as " O projecto duma 'Casa de Contratação' em Lisboa " [The 'Hiring House' project in Lisbon] (1960) and "Os mercadores alemães de Lisboa por volta de 1530" [German merchants in Lisbon around 1530] (1961), among others. Also, in this period he was invited to take part in the preparation of the Dicionário de História de Portugal [Dictionary of Portuguese History] directed by Joel Serrão, with entries on Germans in Portugal , The Fuggers in Portugal and Imhoff , among others. After that, H. Kellenbenz returned to the city of Nuremberg and the University of Nuremberg-Erlangen in 1970, where he had already been a teacher between 1957 and 1960. He remained in this city until his retirement in 1983.

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