Janko's book also makes the excellent point how the terms Greek, Greeks and Greece are used retrospectively and therefore incorrectly. "This is the same as when someone writes that for example King Justinian was born in ‘Yugoslavia' (a state which was made much later on the land where he was born) or that the leader of the Roman slave uprising Spartak was born in ‘Bulgaria' (only because he was born in Thrace, on which territory the state of Bulgaria was later established) etc. Retroactively using the term ‘Greek' for the period in which it didn't exist, suggests to the reader the existence of very old Greek culture etc and this is absolutely incorrect. ‘Yugoslavia' and ‘Bulgaria' do not merit being called the birthplaces of Justinian and Spartak, and Greece and Greeks do not merit ownership of civilization that existed on today's territory of Greece. But we are noticing that for a lot of authors this basic logic and laws of nature are not being followed."