"The calculation of the beginning of our calendar – based on the birth of Jesus – was made by Dionysius Exiguus, who made a mistake in his calculations by several years," the Pope writes.
"The actual date of Jesus's birth was several years before."
The Pope also makes other controversial claims including that there were no animals present at the birth of Jesus and rejects the argument that Jesus was born in Nazareth rather than Bethlemhem.