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Constantin Siegwart-Müller (born Oct. 10, 1801, Lodrino, Switz.—died Jan. 13, 1869, Altdorf) was a Swiss politician who headed the Ultramontane Party at Lucerne and became the leader of the dissident Sonderbund. A lawyer from the canton of Uri, Siegwart-Müller settled in 1832 at Lucerne, where he soon rose to the position of state secretary (1834). In 1839 he abandoned the radical party for the clericalist Ultramontanes, but he subsequently lost his secretarial office in the...