A groundbreaker, Hall of Fame quarterback Y.A. Tittle was part of the 49ers' famed "Million Dollar Backfield", was the first professional football player featured on the cover of Sports Illustrated, and is credited with coining "alley-oop" as a sports term — to describe a high arcing pass. Considered washed-up at 34, Tittle was traded to the Giants following the 1960 season. Over four seasons in New York, he twice set the league single-season record for touchdown passes, won the 1963 MVP award, and led the Giants to three straight NFL championship games. Although he was never able to deliver a championship to the team, Tittle's time in New York is regarded among the glory years of the franchise. The Giants retired his jersey number 14. As Y.A. Tittle celebrates his 90th birthday on Oct. 24, 2016, we present these 14 classic SI photos of No. 14.