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Blazon: In the first field, blue, with a silver lily; in the second, white, with a burning heart pierced by an arrow placed on a bar, all in red and supported by a book in natural color.

The coat of arms is crowned by a silver miter, adorned with three gold bands joined by a pole of the same metal, with the fluttering infules, lined in red, adorned with gold crosses and fringes, and joined to the crossed and superimposed keys of Saint Peter, the one with a gold band and the one with a silver bar, joined by a red cord.

Motto

IN ILLO UNO UNUM.

Explanation

The coat of arms of the Holy Father Leo XIV raises, against a blue background, a color that evokes the heights of heaven and is characterized by its Marian value, a classic symbol referring to the Blessed Virgin Mary, the lily (flos florum).

On the other white field, the emblem of the Augustinian Order stands out: a burning heart pierced by an arrow. This figure symbolically represents the words of Saint Augustine recorded in the Book of Confessions: “Sagittaveras tu cor meum charitate tua” (“You have wounded my heart with your love”). This is an element that, since the 16th century, has always been present in the emblem of the Augustinians, although with different variations, such as the presence of the book that symbolizes the Word of God, capable of transforming the heart of every human being, as it did for Augustine. The book also recalls the illuminating works that the Doctor of Grace gave to the Church and humanity. White (in the ivory-toned papal coat of arms) is a color that recurs in other coats of arms of religious orders and can be interpreted as a symbol of holiness and purity.

The motto, “In Illo uno unum” (“In the one Christ we are one”), echoes the words of Saint Augustine in a sermon, the Exposition on Psalm 127, to explain that “although we Christians are many, in the one Christ we are one.”

Don Antonio Pompili

Vice President of the Italian Genealogical Heraldic Institute