The Church history of Zachariah the Rhetor, compiled in Syrian language soon after the middle of the 6-th century AD contains reliable data about the Proto- Bulgarians. Utilising first-hand accounts the compiler  produced a list of the peoples, who had inhabited the lands north of the Derbend pass (the Caspian gates) during the first half of the 6-th century: "The land Bazgun ... extends up to the Caspian Gates and to the sea, which are in the Hunnish lands. Beyond the gates live the Burgars (Bulgars), who have their language, and are people pagan and barbarian. They have towns. And the Alans -- they have five towns. ... Avnagur (Aunagur) are people, who live in tents. Avgar, sabir, burgar, alan, kurtargar, avar, hasar, dirmar, sirurgur, bagrasir, kulas, abdel and hephtalit are thirteen peoples, who live in tents, earn their living on the meat of livestock and fish, of wild animals and by their weapons."