Women's History Month It's not just literary sources, the royal palace is there. much of it has been excavated and I'm certain you must have seen it with your own eyes. It is a hugh complex of three main buildings looking down on the city from the hills. This is more likely peripheral information and there may be no ancient source which states simply, Pella is the capitol of Macedon. The capital is where the king lives permanently and the court is therefore there. Thus, when someone goes to court at Pella. we know that Pella is the seat of government and therefore, the capitol. I can give you two references from Aeschines both from his speech, " On The Embassy ". in 111 he states, "When the ambassadors had assembled at Pella and Philip had arrived, and the herald called the ambassadors of the Athenians....."and 161 where he states, " and he nicknamed Alexander, Margites, and had the effrontery to say that Alexander would never stir out of Macedon for he was content, he said, to saunter around Pella and keep watch over the omens. " Both of these quotations indicate Pella as the capitol city of Macedon. There must be many more, but they would be peripheral information. I'm certain you can find a great deal more than this if you research documents of the 4th century - rather than specific geographical works.