Kuber

Khan Kuber (or Kouver) was a Bulgar leader, brother of Khan Asparukh and member of the Dulo clan, who according to the Miracles of St Demetrius, in the 670s was the leader of a mixed Christian population of Bulgars, ‘Romans’, Slavs and Germanic people. The Miracles of St Demetrius states that, circa 680 AD, Kuber had a falling out with the Avar khagan, and after repelling an Avar attack, led his followers of around 70,000 people, from Srem and to Macedonia (modern Republic of Macedonia). The Byzantines initially called his people Sermisianoi (after their former settlement - Sirmium), and later the Keramisians (after their new place: the Keramissian plain in Greater Macedonia).

In Macedonia, they had contacts and possibly mixed with the Dragovites - a Slavic tribe in the region. Some of his people wanted to disperse to their respective various homelands. Since they were Christians, they were probably once imperial subjects that were captured by the Avars. Kuber asked the Byzantine...
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