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.