1786-1871. Canadian politician. He led a mission to England to protest against the planned union of Lower Canada (Quebec) and Upper Canada (Ontario), and demanded economic reform and an elected provincial legislature. In 1835 he gained the cooperation of William Lyon Mackenzie in Upper Canada, and in 1837 organized an unsuccessful rebellion of the French against British rule in Lower Canada. He fled the country, but returned 1847 to sit in the United Canadian legislature until 1854.