As part of the series of tapestries by Peter Paul Rubens on the life of Constantine, we find a vignette from the early life of the first Christian Roman emperor showing him slaying a lion with an audience of Roman soldiers looking on. This is an odd anecdote from the life of Constantine and one that is not commonly known. Was it based on an actual event? Or was it one of those medieval interpolations meant to enhance the reputation of an ancient hero as a courageous and powerful hero? Let's take a look at the ancient sources. We know...