why do popes get/chose nicknames instead of using their real name?
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it’s the same reason why Muslim converts often choose Muslim names, it is a form of displaying change and their personal religious beliefs to others. It was likely happening all over Christendom on an individual level as people converted to the faith.
The first pope to adopt the tradition was Pope John II whose original name was Mercurius. Being named after a Roman god wouldn’t look good for the leader of the Catholic Church and it is something that opponents of the church would use as an argument against conversion.
These days popes take the name of a Saint they wish to embody in their directing of the Church. Pope Francis chose a saint that was willingly impoverished and ministered to everyone he could as a sign he wanted to make a more inclusive and humble church.
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