The Seattle Seahawks were founded in 1976. In the early 70's the NFL was trying to add more teams to the league. The Seattle Professional Football Inc. thought that Seattle should have a franchise in the NFL. The NFL let them start a franchise, which was signed into an official agreement by Lloyd W. Norstrom, who died of a heart attack before the Seahawks first game.
How good are they?
They have won 8 division titles, and made it to Super Bowl XL in 2006, only to lose to the Steelers.
Russell Wilson is the current quarterback for Seattle.
Marshawn Lynch is the top running back in Seattle.
Richard Sherman is a very good cornerback for Seattle.