text: The Avars were a Turkic group (or possibly Mongol), possibly with a ruling core derived from the Rouran that escaped the Göktürks. They entered Central Europe in the 7th century AD, forcing the Lombards to flee to Italy. They continuously raided the Balkans, contributing to the general decline of the area that had begun centuries earlier. After their unsuccessful siege on Constantinople in 626, they limited themselves to Central Europe. They ruled over the Western Slavs that had already inhabited the region. By the 10th century, the Avar confederacy collapsed due to internal conflicts, Frankish and Slavic attacks. The remnant Avars were subsequently absorbed by the Slavs and Magyars.
  The Bulgars, Turkic people of Central Asia, first appeared in a wave commenced with the arrival of Asparuh's Bulgars. Asparuh was one of Kubrat's, the Great Khan, successors. They had occupied the fertile plains of the Ukraine for several centuries until the Khazars swept their confederation in the 660s and triggered their further migration. One part of them — under the leadership of Asparuh — headed southwest and settled in the 670s in present-day Bessarabia. In 680 AD they invaded Moesia and Dobrudja and formed a confederation with the local Slavic tribes who had migrated there a century earlier.
  After suffering a defeat at the hands of Bulgars and Slavs, the Byzantine Empire recognised the sovereignty of Asparuh's Khanate in a subsequent treaty signed in 681 AD. The same year is usually regarded as the year of the establishment of Bulgaria (see History of Bulgaria). A smaller group of Bulgars under Khan Kouber settled almost simultaneously in the Pelagonian plain in western Macedonia after spending some time in Panonia. Some Bulgars actually entered Europe earlier with the Huns. After the disintegration of the Hunnic Empire the Bulgars dispersed mostly to eastern Europe.