charles created the title prince of viana for the heir to the throne, entitling his grandson charles in 1423. he was a patron of the arts and he finished construction on the great gothic cathedral of pamplona. when it comes to navarre's home policy, he decreed the watershed unification of pamplona's boroughs in 1423, after over three centuries of division and rivalry. he also built the royal palace at tafalla and the royal palace of olite, where he died in 1425.