b. 1290, d. probably Pisa (Italy), Dec. 13, 1312 (or 1313), posthumous son of Duke Rudolf II, member of the Habsburg dynasty. In 1306 he aspired in vain to the Bohemian throne and to participate in the reign of Austria. From 1307 co-regent of the Habsburg hereditary domains. On May 1, 1308 murdered his uncle King Albrecht I, who had rejected his claim to inheritance, fled to Italy and presumably became a monk in Pisa. F. Schiller assigned him a small but significant role in his drama "Wilhelm Tell".
Literature#B. Hamann, Habsburgerlexikon, 41993.