Any male Catholic is eligible to be pope. However, in recent centuries the pope has been elected only from within the College of Cardinals.
No.
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.
To become a pope, one must be at least 18 years old.
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.
Vatican City
The pope has always been a Christian.
Pope John XXII became pope on August 7, 1316.