Pittsburgh Pirates (1933 - 1939)

The Super Bowl-winningest franchise in football, the Steelers were founded as the Pittsburgh Pirates on July 8, 1933, by Art Rooney. Yes, the name was taken from the baseball team of the same name, but that was the norm for NFL teams during that time. The logo is reminiscent of a British police patch, but the castle definitely foreshadowed the Steelers current dominance.