the royal cavalry standard carried before the Roman emperors in war, esp. that first carried by Constantine, bearing the first two letters (XP) of the Greek Christos (Christ)
Origin of labarumLate Latin (from source Late Greek labaron) from uncertain or unknown; perhaps
- An ecclesiastical banner, especially one carried in processions.
- The banner adopted by Constantine I after his conversion to Christianity.
Origin of labarumLate Latin probably from alteration of Greek labrāton laurel-leaf standard from Latin laureātum neuter of laureātus adorned with laurel ; see laureate .
From Latin labarum, from Ancient Greek λαβαρόν (labaron).