[Gens Rulandica-Hungarian connections of a famous German family of physicians].

The Ruland family of German origin played an important role both in Hungarian and European medical history. Being a rather numerous family, and moreover, due to their habit of preferring to give the same first names to their children and because they worked in a relatively short period (ca. between 1550 and 1650), researchers often confuse one Ruland with the other. The present paper based on source-criticism, makes successful attempts to put the genealogy in order, presenting the history of the family, giving detailed biographies of each single Ruland and bringing together the bibliography of their works as well. As a result of her efforts the author puts a new light on the biographical data of the best known Ruland, namely of John David and at the same time she revisits the activity of John Ruland, who lived and worked in Hungary.