The government of the colony came to be dominated by a small group of persons, known as the "Family Compact", who held most of the top positions in the Legislative Council and appointed officials. In 1837, an unsuccessful rebellion attempted to overthrow the undemocratic system. Representative government would be established in the 1840s. Upper Canada existed from its establishment on 26 December 1791 to 10 February 1841, when it was united with adjacent Lower Canada to form the Province of Canada.