The Byzantines were unable to completely Hellenize Macedonia because their progress north was blocked by the Bulgarian Empire, and later by the Serbian Kingdom, which were both Slavic states.
Bütsantslased ei suutnud Makedooniat täielikult kreekastada, kuna nende edenemisele põhja seisis vastu Bulgaaria tsaaririik ja hiljem Serbia kuningriik, mis mõlemad olid slaavi riigid.