Cool but a legend. Nobody knows which "signo" Constantine saw, since at the time, the cross wasn't used by the christians, they actually despised it, because in the roman society (which christians as well belong to) cross was considered a humiliating death, and the christians didn't want to remember Jesus like that. In that specific time the Cross was just starting to acquire a new meaning (sacrifice and martyrdom) but it would have taken more time still, to become the main christian symbol, much later Constantine. It is more verosimilar he "saw" the "christogram" but in any case it's quite uncertain, since Constantine never specified personally what did he see in his dream. The only source we have about it is from the bishop Eusebios of Caesarea, Constantine chronicler, who obv. had all the reason to legitimate the character of Constantine that way. Also the story about the crosses painted on the soldiers shields, we have even the proof it is false. After gaining the whole empire, back together in one, Constantine wanted to celebrate his success, as a normal emperor of the time, by building a memorial monument, the Column of Constantine, covered in sculptures celebrating his most important victories, including the Milvius Bridge defeat of his rival Massentius. If you look at the column, not only you won't find even a single cross or a christogram on the shields, instead, you'll se only the traditional "Insigna" of the legions and/or pagan symbols
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