>>507624942
>>507625217
It's a copy of Jerome's map from the fourth century.
https://en.wikipedia.org/wiki/Tournai_maps
Supposedly Bulgaria "is the only place on the entire map that was added that didn't exist during his time", or at least that's how they explain its presence there. Either the author who copied the maps inserted solely Bulgaria's name, or the 4th century original already had Bulgaria's name.