lab·a·rum
| \ ˈla-bə-rəm
\
\
Definition of labarum
: an imperial standard of the later Roman emperors resembling the vexillum
especially
: the standard bearing the Chi-Rho adopted by Constantine after he converted to Christianity
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“Labarum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/labarum. Accessed 27 May. 2022.
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Time Traveler for labarum
The first known use of labarum was in 1563
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