With their intelligence and extreme athleticism, these players guided their teams to the top of the league. How much do you know about the NFL's greatest quarterbacks?
Manning was a five-time NFL MVP. Four seasons, he led the entire league in passing yards. And in 2012, he battled back from injury to become the league's Comeback Player of the Year.
Graham was the QB for Cleveland in the 1940s and 1950s. He led the team to 114 wins and only 20 losses, giving him the best winning percentage in NFL history.
Brett Favre was an extraordinary and almost supernatural thrower, able to zip the ball into the tightest corners of the field. He was the first to top 500 TD passes.
Tarkenton played for 18 productive years. He was a third-round pick who wound up becoming a nine-time Pro Bowler.
Roger Staubach was fearless under pressure, even when the Cowboys were trailing at the end of games. He calmly led his team to numerous comebacks.
Graham proudly wore the number 14, which Cleveland retired in his honor. He played for Cleveland for 10 seasons and threw for 174 TDs, while rushing for 44 more.
Brady began his NFL journey all the way back in 2000, when he was a sixth-round draft pick out of Michigan. More than a decade and a half later, he is still one of the best QBs ever to play the game.
Once a Viking always a Viking -- the Giants traded Tarkenton right back to Minnesota. He then proceeded to lead the Vikings to three Super Bowls.
Tarkenton led his team to the biggest game on the biggest stage, but just couldn't break through with a win. Minnesota lost all three games.
Favre wound up with 508 TD passes to his credit. In 2009, he threw for 33 TDs, and then in 2010 (his final season) he threw for just 11.
Unitas was supposedly less than 150 pounds, and coaches worried that he'd get crushed by bigger players. He put on some weight, honed his on-field abilities and became a star player for Louisville.
49ers QB Joe Montana hustled his team down the field against the Cowboys in the 1982 NFC Championship game. As time ticked away, he threw a high, arcing TD pass to WR Dwight Clark to win the game.
Brady is almost more machine than man. Not only does he own the record for the most wins ever, he's still winning at a first-class pace.
Unitas began his career in the 1950s, back when the passing game was in its infancy. He became a first-rate passer, helping to transform the league's offensive mindset.
In Week 12 of the 2016 season, Brady completed 30 passes and threw for two TDs against the Jets. The victory made him only the second QB to nab 200 wins, alongside Peyton Manning.
Montana led San Francisco to four Super Bowls, and he won every single one of them. In three of those games, he was declared the MVP.
Montana was always a clutch performer in the Super Bowl. In four title games, he threw 11 TD passes. The number of interceptions? Zero.
After 14 glorious seasons with the Colts, Manning was traded to Denver, where he played for four years. He led the Broncos to two Super Bowls, winning one.
In 2007, Brady threw for 50 TDs as the Patriots went undefeated during the regular season. In that season's Super Bowl, however, the Giants pulled off an improbable upset to mar the Patriots' otherwise perfect record.
Peyton Manning is the owner of some of the NFL's most treasured records, including the most TD passes thrown in one season. In 2013, he threw for a ridiculous 55 TDs.
In 1984, Marino tossed 48 TDs and led the Dolphins to the Super Bowl, where they lost to the 49ers. He never again reached the Super Bowl.
Elway suffered through three agonizing Super Bowl losses during his career. He won the big game in the last game of his final season, as the Broncos beat the Falcons.
Manning's longevity and top-notch ability made him a lock for the Pro Bowl 14 times. He also won two Super Bowl rings.
Favre never played for the Chiefs. During his two-decade career, he played for the Falcons, Jets, Packers and Vikings.
Elway was 38 when he decided to hang up his helmet for the last time. During his long career, he was selected to the Pro Bowl nine times.
Manning threw for more yards than any other QB in NFL history. He threw for more than 71,000 yards. In just one season, he topped 5,400 yards.
Marino wasn't even tackled on a play against Cleveland, but he tore his Achilles tendon, an injury that ended his season. Prior to the injury, the Dolphins were considered Super Bowl contenders.
Favre played for the Southern Miss Golden Eagles. He played for four years and threw 52 TD passes. His total rushing yards during that same span? -89 yards, along with one TD.
In 1975, Roger Staubach chucked a 50-yard desperation pass during a postseason game against the Vikings, and the Cowboys scored a winning TD. After the game, Staubach remarked that he said a Hail Mary during the throw, and the nickname stuck.