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The text is dedicated to the memory of Professor Gerard Labuda (1916–2010), the eminent historian – medievalist. During his career he held several senior organizational functions in science. He was the director of the Institute of Western Affairs (1958–1961), the Rector of Adam Mickiewicz University (1962–1965), the Vice President of Polish Academy of Sciences (1984–1989), the President of the PAU [Polish Academy of Arts and Sciences] (1990–1994), the President of Poznań Society of Friends of Sciences (1972–1975). Pro domo sua, one has to mention that incidentally, he was also the Chairman of the Research Committee on Polish Diaspora within Polish Academy of Sciences.