Met with the pope and then surprise resignation? I don't understand exactly what happened here, but it seems to have parallels to the meeting of Pope Leo and A

Met with the pope and then surprise resignation? I don't understand exactly what happened here, but it seems to have parallels to the meeting of Pope Leo and Attila the Hun. https://en.wikipedia.org/wiki/Pope_Leo_I#Leo_and_Attila https://en.wikipedia.org/wiki/Pope_Leo_I#Leo_and_Attila