Kosara or Cossara was a Bulgarian noblewoman, a daughter or relative of Tsar Samuel of Bulgaria, who was married to Prince Jovan Vladimir of Duklja, the most powerful Serbian principality of the time.
19th-century drawing of Kosara and Jovan Vladimir.
The First Bulgarian Empire was a medieval state that existed in Southeastern and southeastern Central Europe between the 7th and 11th centuries AD. It was founded in 680–681 after a group of Bulgars,
Theodora Kosara
…Kosara or Cossara (Bulgarian and Serbian: Косара) was a Bulgarian noblewoman, a daughter or relative of Tsar Samuel of Bulgaria, who was married to Prince Jovan Vladimir of Duklja, the most powerful Serbian principality…
Part of the Pliska fortress
Khan Krum defeats the Byzantine Emperor Nicephorus I in the battle of the Varbitsa Pass, Manasses Chronicle
Column fragment with inscription about the victorious campaigns of Khan Malamir
Emperor Simeon I: The Morning Star of Slavonic Literature, painting by Alfons Mucha