There are NFL players past and present who are forever tied to one franchise in the minds of fans. That is typically due to the length of their careers with that team, a vast amount of accolades achieved within a certain amount of time with that team or both.
The San Francisco 49ers have a whole stable of former players who will forever be tied to the franchise. The easy ones to throw out for San Francisco are quarterback Joe Montana and wide receiver Jerry Rice, both of whom had nice long careers with the team and also helped lead the Niners to multiple Super Bowls with their play.