17 mars 1526 - King François I crosses from the Bidasoa River from Spain into France, while at the same time, his sons the Dauphin Prince François and Prince Henri, 8 and 5 at the time, cross into Spain to take his place as hostages to guarantee France's compliance with the Madrid Treaty. King François repudiates the treaty and the two boys remain captive for the next three years (La bande de temps)