The answer might surprise you. What may surprise you even more is how we got here. This will be the main page, so book mark it. You will want to come back as the project moves forward.
When Did the Papacy Become Certainly Vacant?
Many reckon the vacancy of the Papacy from the death of Pope Pius XII on October 9, 1958.
What Happened on October 26, 1958?
Extraordinary Papal Election
The Conciliar Church