Another answer from our community:
It would depend on who is to be trusted as a source. Technically, no one could verify who the pope is/was but the Church, and the Church couldn't do that unless it had a hierarchy, and the head of the hierarchy, and therefore of the Church, is the pope, which means the pope would have to verify himself.
The first pope, as verified in The Bible, is St. Peter. Peter literally translated means "rock", and Christ promises to build his church upon this rock. But note that Christ says "will build" and "will give the keys to heaven". It is a promise that is not yet fulfilled. Protestants assert Christ was here speaking metaphorically, or pointing to either Himself or even an actual rock, however, Christ's changing of Simon's name makes no sense if it is not in conjunction with the office Christ wishes to bestow.
Ironically though, the scriptures need to be verified themselves as true before they can be used as proof of anything. The only institution that can define what is Divinely inspired has to be divinely inspired itself, and only an organization begun by God could have such an ability. Anything that is organized has a hierarchy. Thus, it is the Church, under the guidance of the pope that declares the scriptures to be accepted as divine truth, for only the pope may speak ex cathedra, that is, infallibly, invoking Christ's authority and the powers intrinsic to that authority. Thus, with scripture needing verification from the Church, it is Church tradition which tells us who the first pope is, and the early Church fathers almost unanimously
tell us Peter came before all others. These are independent documents written by experts in the early Christian Church.
Once again, it depends on what is acceptable as a trusted source, but the arguments briefly outlined above have been sufficient for most.
Another Answer
The Church receives Peter, one of the apostles of Jesus Christ, as the first pope. His papal authority was promised by Christ during His ministry (Matthew 16) and activated after His resurrection (John 21) making Peter's papacy to begin around 30(?) A.D. The early Church received Peter in this position as seen in the writings and testaments of the Church fathers.
Pope Francis is the first member of the Jesuit order to be elected as pope, the first pope from the Western Hemisphere, the first pope from the Southern Hemisphere and the first pope from the Americas.
We really do not know. Records from the persecuted Church of the first and second century are rare. We don't know much about some of the early Popes other than their names. Once again, we do not really know but Peter may have been widowed by the time he was martyred in Rome and the first Pope may have been the first unmarried Pope.
The first pope after Peter was Pope Linus.
Pope Pius III was the predecessor of Pope Julius II.
Pope Francis is the first jesuit to be elected as pope, the first pope from the America's and the first pope in many centuries who is not from Europe.
No, he is not the first but he is the first in over 1000 years. He is, however, the first pope from the Americas and the first Jesuit to be elected pope.
The first pope to have a wife was Pope Hormisdas, who served as pope from 514 to 523 AD.
No, Pope Saint Peter was the first pope.
Pope Clement V was the first Avignon pope.
The first pope from Argentina is Pope Francis (Jorge Maria Bergoglio).
There was no black pope in the first century. The first pope from Africa was Pope Saint Victor (189-199) but there is no indication that he was black.
Peter was the first pope in Italy.