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Based on the testimony of emperor Constantine the Great himself, Eusebius of Caesarea presented a labarum in the form of crux dissimulata crowned with the Chi-Rho. The continuers of his Church History in the next century, Rufinus of Aquileia, Philostorgius, Socrates of Constantinople, and Sozomen, only kept the cross-shape of the banner, excluding the christogram. This might have happened because...
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