The fleur-de-lis is a symbol used by the people of New Orleans for years. It was adopted by the New Orleans Saints.
This was part of a controversy when the New Orleans Saints made their Super Bowl run during the 2009 – 2010 season. Ultimately the NFL got slapped down because the symbol has centuries of history in politics, dynasties, art, and religion. This is a symbol that belongs to history and the people of New Orleans not the NFL.