A study of the Eastern roman empire ( the Greek empire) is worthwhile and fascinating and it is not taught in our schools to our detriment.
Rome lasted about 600 years. the Greek empire lasted 1123 plus the 400 years in the Rioman empire. Much to learn here that has impacted our culture.
If you haven’t read “Against the Fall of Night”, by Michael Arnold I highly recommend it. It’s about the Comneni dynasty of emperors.