Greatness has to begin somewhere and in Pittsburgh, it all began on this day in 1933.

Today fans around the world are celebrating the Pittsburgh Steelers 91st Birthday, the day when it all began for the historic franchise.

Art Rooney Sr., known as ‘The Chief’ to his players, coaches, staff and fans, had the team’s application for a National Football League franchise granted a few months prior on May 19, and the Pittsburgh Professional Football Club, Inc. joined the NFL in exchange for a fee of $2,500.

But it wasn’t until July 8, 1933 that it all became official when Rooney, one of the great pioneers of the sports world, brought the NFL to his beloved Pittsburgh. At the time the Steelers joined the Eastern Division and were one of only 10 teams in the NFL.

So much has changed over the years and the Steelers grew to be one of the historic and most-beloved franchises in the NFL.

Little did Rooney know back in 1933, or during the first 40 years of the franchise when the team struggled, that the Steelers would one day be among the NFL elite.

The Steelers have since won six Super Bowls, tied for the most in the National Football League. Since 1969 the team has had only three head coaches, Hall of Famers Chuck Noll and Bill Cowher, and current Coach Mike Tomlin, who have all won Super Bowl Championships.

The Steelers have a remarkable 27 major contributors in the Pro Football Hall of Fame, including players, coaches, owners and more. The team also introduced their own Hall of Honor, highlighting those who have been an integral part of the organization and are highlighted in the Hall of Honor Museum.