Answer
King was Charles IV's title in Navarre. He ascended to the throne in 1328, inheriting the kingdom from his mother, Joan I of Navarre. During his reign, he faced challenges from his powerful neighbors, including France and Castile. However, he managed to maintain Navarre's independence and expand its territories. Charles IV was also a patron of the arts and culture, and he established the University of Navarre in 1348.