This article details the history of the Baltimore Ravens, a professional American football team which plays in the National Football League. The Ravens were formed to fill in the void left by Baltimore's previous team, the Colts, who had controversially moved to Indianapolis. Ironically, the Ravens' formation necessitated the relocation of the Cleveland Browns' players and personnel, leaving Cleveland without a team until the Browns resumed operations as an expansion team three years later. Since then, the Ravens have usually featured a strong defense and have won two Super Bowl championships.