Carlos III the Noble granted the privilege to keep holiday in the year 1418, and in 1423 he granted them a seat in the Cortes, among the "Good Towns," and exempting the Tafallese from all servitude, while declaring them free men. In the Civil War of Navarre, Tafalla sided with the Beaumont confederacy, defending the rights of Carlos Prince of Viana, although after the Castilian-Aragonese invasion it defended the legitimate kings of Navarre against the invaders.