I'd like you to provide proof of that.
The Vikings never won a NFL championship before the Super Bowl era and have never won a Super Bowl. They may have won a NFL championship before the merger but they lost the Super Bowl to Kansas City that year.
A history of FAIL.
The so called superbowls 1-4 were exhibition games. The AFL was not part of the NFL until the 1970 season.
http://en.wikipedia.org/wiki/NFL_Championship_Game,_1969
Or you can google it yourself "1969 NFL Champions"