The Enchiridion of Pope Leo

P 4

An illustration shows a rectangular frame with double lines enclosing a circular emblem. In the middle of the emblem is the Chi-Rho monogram, which represents Jesus Christ using the first two letters of his name in Greek. Around the circle is the Latin motto "By this, conquer" original: "IN HOC VINCE". The word "IN" sits at the top, "HOC" is on the right side, and "VINCE" is on the left side.

original: "IN HOC VINCE." This phrase is famously associated with the vision of the Roman Emperor Constantine the Great, who reportedly saw this sign in the sky before a decisive battle.

Chi-RhoA symbol for Christ created by overlaying the Greek letters Chi (X) and Rho (P)., ChristogramA combination of letters that serves as a shorthand symbol for the name of Jesus Christ., By this, conquer, emblem, LabarumA military standard from the late Roman Empire that featured the Chi-Rho symbol.