The Sabirs were a nomadic Turkic equestrian people who lived in the north of the Caucasus beginning in the late-5th–7th century, on the eastern shores of the Black Sea, in the Kuban area, and possibly came from Western Siberia. They were skilled in warfare, used siege machinery, had a large army and were boat-builders. They were also referred to as Huns, a title applied to various Eurasian nomadic tribes in the Pontic-Caspian Steppe during late antiquity. Sabirs led incursions into Transcaucasia in the late-400s/early-500s, but quickly began serving as soldiers and mercenaries during the Byzantine–Sasanian Wars on both sides. Their alliance with the Byzantines laid the basis for the later Khazar-Byzantine alliance.