The Jireček Line is a conceptual boundary through the ancient Balkans that divides the influence of the Latin (in the north) and Greek (in the south) languages from Antiquity until the 4th century. It goes from near the city of Laçi in modern Albania to Serdica (now Sofia, in Bulgaria) and then follows the Balkan Mountains to Odessus (Varna) on the Black Sea.
The placing of the line is based on archaeological findings: most of the inscriptions found to the north of it were written in Latin, while most of the inscriptions found to the south were in Greek.
It was originally used by the Czech historian Konstantin Jireček in 1911 in a history of the Slavic people.
More recent scholars have revised it somewhat: Kaimio (1979) places Dalmatia and Moesia Superior in the Latin area and Moesia Inferior in the Greek sphere. MacLeod (1982) suggests that there may not have been "an official language policy for each and every aspect of life" but that "individual Roman officials [made] common sense ad hoc decisions". He also points out that during that time, when the area was under the Roman rule "even in Greek areas... Latin was the dominant language in inscriptions recording public works, on milestones, and in the army."
- Jireček, Konstantin, Geschichte der Serben ' The history of the Serbs ', Gotha, 1911.
- Kaimio, Jorma, The Romans and the Greek Language, Commentationes Humanarum Litterarum 64. Helsinki: Societas Scientiarum Fennica, 1979. (not seen)
- MacLeod, M.D., review of Kaimio, 1979 in The Classical Review, New Ser., 32:2:216-218, 1982. JSTOR