Catholic Answer:
Nearly 2000 years of Catholic tradition have Peter martyred during the reign of Nero sometime between the years 64-67. He was crucified upside down by his own request. As to the statement purportedly made by Pope Anicetus, it never happened. Virtually nothing is known about the reign of this pontiff. All that is recorded is that he had a visit from Saint Polycarp to discuss the date when Easter should be observed. Both agreed to disagree and parted amicably.
Peter's death is not discussed in the Bible.
Paul was not crucified upside down, he was beheaded. Peter was the apostle that was, as he said he did not deserve the same death as Jesus.
Peter is a martyr, because he was crucified upside down by the Romans until he died. He was crucified upside down, because he did not consider himself to be worthy to be crucified right side up as Jesus was, so Peter asked to be crucified upside down after he was sentenced to death on the cross.
Peter was crucified upside down between 64 and 67 AD.
There is no specific chapter in the Bible that mentions Peter being crucified upside down. This information comes from historical accounts, particularly from writings by early church fathers like Origen and Tertullian. Peter's martyrdom is believed to have happened in Rome during the reign of Emperor Nero.
Saint Peter, one of the twelve apostles of Jesus, is traditionally believed to have been crucified upside down at his own request, as he felt unworthy to be crucified in the same manner as Jesus. This event is not explicitly mentioned in the Bible but is recorded in early Christian writings and traditions.
Simon was crucified upside down in the Bible.
Peter was crucified in Rome , he wanted it to be him upside down.
Peter, one of Jesus' disciples, is believed to have been crucified upside down in Rome during the reign of Emperor Nero.
An upside down cross represents Saint Peter, the Disciple, of his unworthiness to be crucified like Christ. [Backstory: Peter was crucified upside down] An upside down cross WITH Jesus on it is something totally different and is used often by the occult to show their rejection of Christianity.
One of Jesus' disciples named Simon Peter was Crucified upside down. The reason he was upside down is that he did not count himself worthy to be crucified in the same way as Jesus.
Tradition says that St. Peter was crucified upside down.