I wouldn’t say it’s ignored. Among the general population, the best known polities in the world from 500-1000 (which is a huge stretch of time) are probably the

I wouldn’t say it’s ignored. Among the general population, the best known polities in the world from 500-1000 (which is a huge stretch of time) are probably the Byzantine Empire, the Tang Dynasty, the Carolingian Empire and the Caliphates.