Roman Empire
Diocletian gave Galerius the office of caesar
Philippopolis (Present-Day Plovdiv, Bulgaria)
In the spring of 293, in Philippopolis (Plovdiv, Bulgaria) or Sirmium, Diocletian gave Galerius the office of caesar, husband to Diocletian's daughter Valeria, and perhaps Diocletian's praetorian prefect.
