
1) Former country in the Balkans 2) Historical region in Bulgaria 3) Historical region in Serbia
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https://www.crosswordclues.com/clue/moesia

Moesia (ə, ə, or ə; Latin: Moesia; Μοισία) was an ancient region and later Roman province situated in the Balkans, along the south bank of the Danube River. It included most from the territory of modern-day Serbia (without Vojvodina) and the northern parts of the Republic of Macedonia, (Moesia Superior), as well Northern Bulgaria and Roma...
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http://en.wikipedia.org/wiki/Moesia

province of the Roman Empire, in the southeastern Balkans in what is now Serbia, part of Macedonia, and part of Bulgaria. Its first recorded people ... [4 related articles]
Found on
http://www.britannica.com/eb/a-z/m/107

Ancient district in eastern Europe, corresponding roughly to modern Serbia and Bulgaria. The inhabitants were subdued by the Romans in 29 BC and it was formally organized as a Roman province shortly...
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http://www.encyclo.co.uk/local/20688

archaic or obsolete terms > Places: Serbia, Bulgaria
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http://www.skyscript.co.uk/glossarytt.html

an ancient country in S Europe, S of the Danube and N of ancient Thrace and Macedonia: later a Roman province.
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https://www.infoplease.com/dictionary/moesia
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