The NFL Century Division had four teams in each season; however, it had five different members: Cleveland Browns, New Orleans Saints, New York Giants, Pittsburgh Steelers, and St. Louis Cardinals.
[2] In 1967 and 1969 the four teams were the Browns, Cardinals, Giants, and Steelers.
For the 1968 season, the Giants were placed in the Capitol Division, with the Saints switching to the Century.
While the origin of name Century Division is not completely certain, it has been hypothesized that the name could have been intended to be a reference to the centennial of American football, which is generally regarded to have emerged as a distinct game in the late 1860s.
Cleveland and Pittsburgh joined the AFC Central (later the AFC North), with the Cincinnati Bengals (from the AFL West) and Houston Oilers (from the AFL East).