What was the event that led to the Roman Emperor Constantine's conversion to Christianity?

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According to tradition, Constantine saw a vision of a cross in the sky before the Battle of Milvian Bridge in 312 CE. He was told in the vision to use the symbol of the cross on the shields of his soldiers and was victorious in the battle. This event is considered to be a major factor in his conversion to Christianity.

What Was the Event That Led to the Roman Emperor