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Popes' Coat of Arms and Saint Malachy Prophecy of the Popes
No pope chooses his name or coat of arms based on the Prophecies of Popes which are attributed to the Irish St. Malachy. That seems like a reasonable weak reason for a pope to choose his papal name based on St. Malachy’s predictions, to say the least, if not superfluous altogether by some people.
Any connection of these Latin mottos to a pope’s coat of arms of name or some else involved in a pope’s life is up to chance.
Proponents of the prophecies have attempted to link these mottos to various Supreme Pontiffs in various ways as the Wikipedia article on the Prophecy of the Popes points out.
It is more the proponents of the prophecies that create the suitable links between a particular pope and his St. Malachy’s motto.
Since the Vatican does not recognize this as an valid prophecy, anyone could interpret it a particular motto in their own way.
I am personally unsure if this prophecy is true or not, however it seems to have an eerily accurate tone to it, to say the least.
I am personally at divergence with most proponents of the Prophecy of the Popes, when it comes to the interpretation given to the current Pope Francis as this question points out: Pope Benedict XVI and Pope Francis and the Prophecy of the Popes.