premise: Giovanni Visconti — according to Lorenzo Cardella nephew of Pope Gregory X. He was ostensibly created cardinal-bishop of Sabina by his uncle in 1275 and in 1276 was named judge in the case concerning the translation of bishop Giovanni of Potenza to the archbishopric of Monreale, postulated by the cathedral chapter of Monreale. He died in 1277 or 1278.
hypothesis: Giovanni Visconti never left the church
reason: This is neither true or not true because it doesnt say whether or not he left the church. The system has a hard time with leaving