https://en.wikipedia.org/wiki/Sclaveni
The Byzantines broadly grouped the numerous Slav tribes living in proximity with the Eastern Roman Empire into two groups: the Sklavenoi and the Antes. The Sclaveni were called as such by Procopius, and as Sclavi by Jordanes and Pseudo-Maurice (Greek: Σκλαβηνοί (Sklabēnoi), Σκλαυηνοί (Sklauēnoi), or Σκλάβινοι (Sklabinoi); Latin: Sclaueni, Sclavi, Sclauini, or ...