The Battle of Adrianople was fought in 1254 between the

Byzantine Greek Medieval Greek (also known as Middle Greek, Byzantine Greek, or Romaic) is the stage of the Greek language between the end of classical antiquity in the 5th–6th centuries and the end of the Middle Ages, conventionally dated to the Ottoman co ...

Empire of Nicaea The Empire of Nicaea or the Nicene Empire is the conventional historiographic name for the largest of the three Byzantine Greek''A Short history of Greece from early times to 1964'' by W. A. Heurtley, H. C. Darby, C. W. Crawley, C. M. Woodhouse ...

and the

Bulgaria Bulgaria (; bg, България, Bǎlgariya), officially the Republic of Bulgaria,, ) is a country in Southeast Europe. It is situated on the eastern flank of the Balkans, and is bordered by Romania to the north, Serbia and North Macedon ...

ns.

Michael Asen I of Bulgaria Michael II Asen ( bg, Михаил II Асен; 1239 – December 1256/January 1257) was emperor (tsar) of Bulgaria from 1246 to 1256 or 1257. He was the son of Ivan Asen II and Irene Komnene Doukaina. He succeeded his half-brother, Kaliman I A ...

tried to reconquer land taken by the

, but the swift advance of

Theodore II Lascaris Theodore II Doukas Laskaris or Ducas Lascaris ( gr, Θεόδωρος Δούκας Λάσκαρις, Theodōros Doukas Laskaris; 1221/1222 – 16 August 1258) was Byzantine emperor, Emperor of Empire of Nicaea, Nicaea from 1254 to 1258. He was t ...

caught the Bulgarians unprepared. The Byzantines were victorious.

References

13th century in Bulgaria Battles involving the Second Bulgarian Empire Battles of the Byzantine–Bulgarian Wars in Thrace Battles involving the Empire of Nicaea Conflicts in 1254 History of Edirne 1254 in Europe {{Byzantine-stub