A big reason why Green Bay is now nicknamed Titletown is because of Bart Starr. Sure, Vince Lombardi gets a lot of credit, but it was Starr that revolutionized the game back then.
He had a passer rating of 104.3 in 1966 and 105 in 1968. By the time he retired in 1971, both would remain in the top ten of the NFL single season records until 1991.
How amazing is that? In an age when the Packers were known for the Power Sweep, ferocious defenses and an unstoppable head coach, it was Starr that was constant.