The Arizona–Arizona State football rivalry, sometimes known as the Duel in the Desert, is a college football rivalry between the University of Arizona Wildcats and the Arizona State University Sun Devils. Though not one of the longest football rivalries, the winner receives the Territorial Cup, created for the 1899 champion between schools in Arizona and which the NCAA has certified as the oldest rivalry trophy in college football. While the Territorial Cup did not change hands as a regular part of the competition until 2001, the rivalry between the two schools continued after 1899, a semi-regular event until becoming an annual event from 1946 onwards. It is part of the wider Arizona–Arizona State rivalry, which crosses 20 varsity intercollegiate sports.