You do not apply to become Pope. You are elected by Papal Conclave after the death of the incumbent Pope. While any baptized male Catholic can be made Pope, usually he is selected from the College of Cardinals, although there was a Pope who was an Arch-Bishop before his election. That was the lowest rank ever.
The Pope appoints you as one.
To apply to become a trainee solicitor, one needs to apply to the Solicitors Regulation Authority (SRA). One can then apply directly to specific companies for jobs.
Odo was never the pope.
Saladin was never a pope.
Saladin was not a pope.
A priest could only become pope if he is elected by the cardinals in conclave.
You become a pope when you are elected as such in a secret conclave held in the Sistine Chapel of the Vatican to replace a pope who as either died or retired.
He was elected as pope on April 22, 1073.
There has never been a Pope John Benedict.
The pope has always been a Christian.
Vatican City
Pope Sixus IV began his papacy on: August 9, 1471