John IV was a 7th-century bishop of Rome who held the papacy from late 640 until his death in 642. Born in Dalmatia to a man named Venantius, he was a highly educated individual who served as an archdeacon before his election followed a four-month vacancy. During his brief reign, he focused on theological disputes, such as condemning Monothelitism and addressing Easter calculations with the clergy in Scotland and Ireland. He is also remembered for his efforts to support his native region during times of invasion.
Papal activities
While serving as pope-elect, John addressed theological errors regarding the timing of Easter among Irish and Scottish clergy. He also defended Honorius I against accusations of heresy by clarifying the previous pope's intentions regarding the will of Christ. To assist people in Dalmatia and Istria suffering from Slavic invasions, he sent Abbot Martin with funds to ransom captives. He also moved important relics to Rome to honor saints from his homeland.
Legacy and veneration
John is credited with helping to establish the Catholic Church in Croatia alongside Abbot Martin. He built an oratory in Rome to house the Dalmatian relics, which featured mosaics of himself. He is recognized as a saint and was laid to rest in the Basilica of St. Peter.