Wikipedia
Perbundos
Perbundos (, Perboundos) was a 7th-century king of the Rhynchinoi, a Slavic group in Macedonia. In ca. 675 he was taken prisoner by the Byzantine Empire due to his hostile intentions towards Thessalonica, and transported to Constantinople. Perbundos managed to escape, but was recaptured and executed, whereupon the Slavic tribes of Macedonia rose up and laid siege to Thessalonica.