In hoc signo vinces

It was the 27 October 312 d.C. evening. The Tiber flowed against the colomns of the Ponte Milvio, dividing the camps of the two enemy emperors.
In one of the camps, Massenzio, big and wild, controlled the army (that the day after would have to fighthe decisive battle) and spured them on to violence and braveness.
In the other camp, Costantine thought in front of the tent; his legionaries all over the camp, prepared their arrows and javelins.
Costantine observed the sky, that was becoming golden. Suddenly, in that gold, a cross brightened and, on the cross, with flamed letters, there was written: "With this sign you'll win" (In hoc signo vinces).
The young Emperor jumped and opened his arms surprised; and when the cross disappeared, he covered his face with his hands and remembered all his childhood lived with his christian mother; and he remembered that all his legionaries were secretely christians.
Costantine called his men and told them that on the battle day, next to the roman eagle, the flag with the cross would wave. A murmur of surprise ran through the legionaries but then it became a cry of joy. The dawn of the day after saw the two armies facing each other, on the two ends of Ponte Milvio . The flags and shields of the armies of Costantine, brightly displayed the cross. The holy sign inspired great pride in the Roman troups as they took the bridge and defeated the Massenzio's army.
Costantine won under the cross sign. Claimed Emperor, he entered in Rome triumphanlly. A great arch was built to honour him. You can still admire it next to the Colosseum, today.