What Pope Leo XIV’s coat of arms and motto reveal about his dedication to the ideals of St. Augustine − an art historian explains

A 17th-century stained glass image of St. Augustine. Artist Tobias Müller, 1622. Michel M. Raguin, with the permission of the Princeton University Art Museum, Princeton NJ, U.S.

Pope Leo XIV has announced his motto and coat of arms – a long-held tradition for those in the ranks of bishops, cardinals and popes. The choice of symbols and words reflects the person’s experience.

Leo’s shield is divided diagonally: The upper half shows a white lily on a blue background, and the lower shows the emblem of the Order of St. Augustine – an order to which he belongs. His motto reads, “In Illo uno unam,” translated as “In the One, we are one,” which are words of St. Augustine from his Exposition on Psalm 127, Paragraph 2: “I understand one in the One Christ. You are therefore many, and you are one; we are many, and we are one. ”