Pope John IV can also refer to Pope John IV of Alexandria.Pope John IV (Latin: Ioannes IV; died 12 October 642) was head of the Catholic Church from 24 December 640 to his death in 642.
His election followed a four-month vacancy.
he wrote to the clergy of Ireland and Scotland to tell them of the mistakes they were making with regard to the time of keeping Easter, he condemned Monothelism as heresy and excommunicated Pope Honorius I in a 682 letter to the Byzantine Emperor Constantine IV