The AFC North currently has four members: Baltimore Ravens, Cincinnati Bengals, Cleveland Browns, and Pittsburgh Steelers. The original four members of the AFC Central were the Browns, Bengals, Steelers and Houston Oilers (now the Tennessee Titans).
The AFC North is the only division in the AFC that does not contain a charter team from the original American Football League. However, the Cincinnati Bengals were an AFL expansion team in the 1968 AFL season (the Steelers and Browns joined the AFC in 1970), although the Bengals joining the AFL was contingent on the team joining the NFL after the AFL–NFL merger was finalized in 1970], as Paul Brown was not a supporter of the AFL.
Three of the teams have interlocked histories. Both the Bengals and the Browns were founded by Paul Brown, while the Ravens and the city of Cleveland have their own unique relationship. Only the Steelers, who are older than the original Browns, have no direct history involving Paul Brown.