Kuber

[7] According to a scholarly theory, first proposed by the Bulgarian historian Vasil Zlatarski, Kuber was the fourth son of Kubrat, the Christian ruler of the Onogur Bulgars in the steppes north of the Black Sea.

[14] Finally, Croatian researchers have proposed that Kubrat of Onoguria's five sons correspond to the five brothers from White Croatia who took Avaria in 677, whereby Kuber would be Chrobatos (Χρωβάτος).

[11][24] He decided to settle together with the Sermesianoi in a plain and sent his envoy to the Byzantine Emperor, whom the Miracles of Saint Demetrios did not name, to request his permission.

[25] Some modern historians – including Zlatarski and Cankova-Petkova – say that he established a state in Macedonia which existed in parallel with Khan Asparukh's Bulgarian Empire.

[26] They also write that the Byzantine Emperor Justinian II who had subjugated the Slavic tribes around Thessaloniki was ambushed and defeated by the Bulgars from Kuber's state on his return to Constantinople in 689.

[26][27] Asparukh's son, Tervel, cooperated with his "uncles in the region of Thessaloniki" against the Byzantine Emperor Justinian II, according to the inscription on the Madara Rider.

[28][29] The Macedonian archaeologist Ivan Mikulčić, who attributes the treasures found at Vrap and Ersekë to Kuber's people, says that archaeological findings confirm their presence in North Macedonia and eastern Albania.