When Pope Benedict VIII passed away,he was followed by his younger brother Romanus. Romanus was a secular politician and also a layman. On being “elected” Pope he was ordained in all the offices of the Church up to Bishop in a single day. Pope John XIX did his very best to help along the coming split with the Eastern Church when the Patriarch of Constantinople essentially bribed John to recognize the Patriarch as head of all Christians in the East. John accepted the gifts and was going to go along with this idea until other leading Churchmen and even the Holy Roman emperor told the Pope this was a horrible idea(This would have made the Patriarch of the East equal with the Bishop of Rome). John quickly changed his mind…….but kept all the loot he had been bribed with(the countdown to schism with the Eastern Church inches closer and closer)
The goofy numbering of Popes named John takes another detour after this Pope because after XIX,the number XX is completely skipped for some reason.