The earliest biographic information about Alexander Guagnini is recorded by Szymon Starowolski in his "Scriptorum Polonicorum εχατοντας" in 1622. Later briefly Guagnini was mentioned by Franciszek Bohomolec in the fourth volume of his "Zbior dziejopisow polskich w czterych tomach zawarty" (Work collection of Polish chroniclers in four volumes). It is possible that the information about the Italian was based on the excerpt from the Szymon Starowolski's book.
