The rooster at the top of the spire holds three relics: part of the Crown of Thorns, one of Saint Denis’s relics and one of Sainte Genevieve’s relics. It is a true “spiritual lightning rod,” protecting everyone who praises God inside the cathedral, the icon of heavenly Jerusalem. Cardinal Verdier, archbishop of Paris, place them there in the presence of the canon chapter on 25 October 1935.