Pittsburgh Steelers

The Pittsburgh Steelers were founded by Arthur J. Rooney on July 8, 1933. Now the seventh-oldest franchise in the NFL, the Pittsburgh team was known as the Pirates until 1940. The Steelers struggled for their first 40 years without winning a championship of any kind until they won the AFC Central division title in 1972. Two years later, the entire sports world cheered when Art Rooney, one of world's most popular sports figures, received the Vince Lombardi Trophy after the Steelers' victory in Super Bowl IX.

After so many years of frustration, the 1970s Steelers began one of the most incredible streaks in sports history when they earned eight consecutive playoff berths, seven AFC Central titles and four AFC championships from 1972 to 1979. The Steelers became the first team to win four Super Bowls and the only team to win back-to-back Super Bowls twice. The team of the decade of the 1970s became the first AFC team to win its division 10 times since the NFL's 1970 merger.

More recently, the Steelers became the third team to win five Super Bowls after they defeated the Seattle Seahawks in Super Bowl XL.  The 2005 wild-card Steelers, led by coach Bill Cowher, also became the first wild-card team in history to win three playoff road games and the Super Bowl. Following the 2006 season, Cowher resigned and was replaced by Mike Tomlin, the team's third head coach since the 1969 season.
 
Source:
Pro Football Hall of Fame