Sorry. 4th century. When Constantine abandoned Rome for Istanbul. Of course, there may be some who sincerely thought that taking over the civil leadership in Caesar's stead was the right thing to do. It wasn't. It was against scripture (Matthew 20:25-28) and the fruits of that move resulted in Popes such as Innocent and Gregory who thought they ruled the world. Kings of heaven, earth, and hell. And the last 4 popes thought likewise with the current one placing himself as the only viable candidate for world premier. All the conflicts, the rebellions, the politicking, the manipulating of society throughout the last 500 years has been leading up to this. Your Jesuits have done a remarkably good job.
the valid pope does rule the world
All things are subject to Christ the king Matt 28:18
Not in rigid governance but in service
Safeguarding both the faithful and the deposit of faith from all errors and heretics
Christ is king and the valid pope is His personal representative
So He must rule