 The Onogur Bulgars under a Kuber leader expelled from western Onoguria (Sirmium) moved south, settling in the present-day region of Macedonia.The Onogur-Bulgars, led by Khan Asparukh—the father of Khan Tervel—settled permanently along the Danube (c. 679–681), expanding the First Bulgarian Empire from Onogur, Bulgaria.Although the Avar empire had diminished to half its original size, the new Avar-Slav alliance consolidated their rule west from the central parts of the mid-Danubian basin and extended their sphere of influence west to the Viennese Basin.