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During his term of office, Stüssi attempted to extend the rule and influence of his city. In 1436, Count Friedrich VII of Toggenburg died, leaving neither heir nor will. The canton of Zürich, led by Stüssi, claimed the Toggenburg lands; the cantons of Schwyz and Glarus made counter-claims, backed by the other cantons. Stüssi allied himself in 1442 with Frederick III, Holy Roman Emperor against the Old Swiss Confederacy.