  We propose to follow the itinerary of Claude Chevalley during the last twenty
years of his life, through the words of Jacques Roubaud, Denis Guedj and
Alexander Grothendieck. Our perspective is that of their testimonies filled
with friendship. This point of view flow us away from the well-known picture of
Claude Chevalley within the Bourbaki group during the previous period. We will
conclude this journey by following the becoming of his numerous writings that
great mathematicians and friends have striven to keep alive after his passing.
