What is "mauros"

Mauros (; , "black, dark") ( fl. 686–711) was a Bulgar leader, one of the chief subordinates and closest supporters of Kuber, a 7th-century Bulgar ruler in Macedonia. After orchestrating a foiled attempt to capture Thessaloniki for Kuber, Mauros remained in the city and joined the ranks of the Byzantine aristocracy. He was bestowed the noble title of patrikios and was deeply involved in the power struggle between Justinian II and Philippikos Bardanes in the beginning of the 8th century. Mauros is the earliest attested leader, styled archon, to be placed by the Byzantine government in charge of a dependent people, in this case the Bulgars and Sermesianoi who had fled to Byzantium.