What football team started hosting annual Thanksgiving Day games in 1966?

The Dallas Cowboys started hosting Thanksgiving Day games in 1966. The NFL has been playing Thanksgiving Day games since the twenties. Contrary to popular belief the Cowboys were started as an expansion team in 1960. The Lions have had the game since 1934 (exept the years 1939-1944), and the Cowboys have hosted a game each year since 1966(excluding 1975 and 1977 when the St. Louis Cardinals hosted the game).