Complex sentence: The coins would feature the phrases "Rex Regnantium" or "King of Those who Reign" over the image of Christ and over the emperor "Justinianus Servus Christi" or "Lord Justinian, Slave of Christ".
Split into simpler sentences: The coins would also feature the phrases "Rex Regnantium" or "King of Those who Reign" over the image of Christ. Over the image of the emperor was the phrase "Justinianus Servus Christi" or "Lord Justinian, Slave of Christ".