Slavs
Menander Protector mentions a Daurentius (577–579) that slew an Avar envoy of Khagan Bayan I. The Avars asked the Slavs to accept the suzerainty of the Avars, he however declined and is reported as saying: "Others do not conquer our land, we conquer theirs – so it shall always be for us".

Q: Who slew an envoy of Khagan Bayan I?
Daurentius