The Battle of Kupa occurred at
Kupa
The Kupa () or Kolpa ( or ; from la, Colapis in Roman times; hu, Kulpa) river, a right tributary of the Sava, forms a natural border between north-west Croatia and southeast Slovenia. It is long, with its border part having a length of and t ...
river in 819. It involved Frankish vassal Duke
Borna of
Dalmatia, with an army of
Guduscani
The Guduscani or Goduscani ( hr, Guduščani, Gačani) were a tribe whose location and origin on the territory of early medieval Croatia remains a matter of dispute. According to one hypothesis they were located around present-day Gacka (Lika), be ...
, against the advancing army of Frankish rebel, Duke
Ljudevit of the
Slavs in Lower Pannonia. During the battle, the Guduscans abandoned Borna and joined Ljudevit. While Borna's forces suffered massive losses, he managed to escape with his bodyguards. However, Dragomuž, Ljudevit's father-in-law, who sided with Borna, was killed. Ljudevit suffered heavy casualties that included 3,000 soldiers and over 300 horses. Afterwards, Ljudevit used the momentum to invade Dalmatia in December 819.
Sources
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Kupa
The Kupa () or Kolpa ( or ; from la, Colapis in Roman times; hu, Kulpa) river, a right tributary of the Sava, forms a natural border between north-west Croatia and southeast Slovenia. It is long, with its border part having a length of and t ...
9th-century military history of Croatia
Kupa
The Kupa () or Kolpa ( or ; from la, Colapis in Roman times; hu, Kulpa) river, a right tributary of the Sava, forms a natural border between north-west Croatia and southeast Slovenia. It is long, with its border part having a length of and t ...
819
9th century in Croatia
{{Croatia-hist-stub