When I saw the "chevaliers", I thought the answer could be an explosive song (the dynamite as the 1st clue), what is Montségur, but then, when I saw that the right song to guess was Isle Of Avalon, I didn't understand at first what some corn flakes had in common with dynamite, the guy called Tim and the knights, but I got it only after @MindRuler's answer and your post explaining the clues.Thank you @TheMercenary
I thought you had it.