King Juan I of Aragon was a monarch who ruled from 1387 until his death in 1396. He was the son of King Pedro IV of Aragon and Constance of Sicily. His reign was marked by efforts to strengthen the kingdom and maintain peace, although he faced challenges from rival factions and external threats. Juan I was also known for his marriage to Violante of Bar, which helped to solidify alliances within the region. His rule contributed to the ongoing development of the Crown of Aragon, a significant political entity in medieval Spain, influencing the region's history and culture.