Cleveland Brown
Houston Oilers
ANSWER
There have been a lot more than two.
Technically, the Baltimore Ravens are the old Cleveland Browns franchise, but the NFL considers the Browns' history to have remained in Cleveland from the original team and treats the Ravens as a "new" team.
The Patriots were originally known as the Boston Patriots but now play about halfway between Boston and Providence, Rhode Island. They're still considered Boston's home team, though.
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Three NFL teams were moved to the AFC in 1970 ... the Baltimore Colts, Pittsburgh Steelers, and Cleveland Browns.