From 1963 to 1966, Buffalo experienced its first stretch of success, making the playoffs all four years and winning back-to-back AFL championships in 1964 and 1965 under head coach Lou Saban. The Bills made it to a third straight AFL championship game in 1966, with the winner representing the AFL in the first AFL-NFL World Championship Game, later known as "Super Bowl I". However, they lost to the Kansas City Chiefs, who went on to play the Green Bay Packers.