Hello! I am planning on writing a novel, but I'm having trouble finding out how to make my fictional characters and their backgrounds fit the historical/geographic setting. It is set in Ancient Rome, and it's history is very well known - but my story needs me to create a new empire to dwell against Rome. I may not be making myself clear since english is not my first language, but my difficulty/doubt lies in whether it would work or not to combine non-fictional characters and facts with real history. Thank you!