That school had their mascot wearing the "garb" of the wrong tribe and flailing about like Big Bird on drugs. The school said (a) he never was a real person and (b) if he was, he wouldn't have any living descendents today.
His name was Mamenthouensa, a.k.a. Francois-Xavier Rouensa. He was the Chief of the Illiniwek Confederation of Five Tribes and a personal friend of the King of France. (Letters preserved in the Court of France). As for his not having any descendents today - my grandsons, and the thousands of other children across this nation who descend from him are not exactly invisible. They have a proud heritage and there would have been no problem at all if that school hadn't been arrogant about the issue, if they had used the correct mode of dress, and the correct dances. We were offended by the disrespect they showed our ancestor and ended up having to force them to stop.