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I have not found any English-language sources describing this individual. William Urban's The Teutonic Knights merely names him as "Heinrich Bart" in its list of grand masters, while German sources refer to him as "Heinrich von Tunna". "Heinrich Bart" is used less in German as it also refers to a 19th century explorer. "Henry of Tunna" seems to be original research. Olessi00:36, 1 March 2007 (UTC)