The labarum (Byzantine Greek: λάβαρον or λάβουρον) was a vexillum (military standard) that displayed the "Chi-Rho" symbol ☧, a christogram formed from the first two Greek letters of the word "Christ" (Byzantine Greek: ΧΡΙΣΤΟΣ, or Χριστός) – Chi (χ) and Rho (ρ). It was first used by the Roman emperor Constantine the Great.
The labarum (Byzantine Greek: λάβαρον or λάβουρον) was a vexillum (military standard) that displayed the "Chi-Rho" symbol ☧, a christogram formed from the first two Greek letters of the word "Christ" (Byzantine Greek: ΧΡΙΣΤΟΣ, or Χριστός) – Chi (χ) and Rho (ρ). It was first used by the Roman emperor Constantine the Great.
Source: Wikipedia "Labarum" · CC BY-SA 4.0
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