With the death of Samo, some Slavic tribes again came under Avar rule.
The Bulgar Khan Kubrat died in 665 and was succeeded by Khan Batbayan of Old Great Bulgaria.
By 670, the Viennese chronicle records that in 677, the "Ungri" (Onogur Bulgar) ethnicon was established decisively in Pannonia.

Following Khan Kubrat's death or a few years later in the time of Bezmer, the empire was dissolved into 5 branches.
Two of them (led by Batbayan and Kotrag) were subdued by the emerging Khazar Empire, while the third one led by Asparukh established the Danube Bulgar Empire and stabilized it by the victory at the battle of Ongal.
The fourth folk moved to Ravenna while the fifth one, led by Kuber moved into the Avar Khaganate.

According to the Miracles of Saint Demetrius the Avar-Slavic alliance from northern Carpathia forced the Bulgars south out of western Onoguria (Sirmium) at about the same time that the Battle of Ongal took place south of the eastern Carpathians.
The new ethnic element marked by hair clips for pigtails; curved, single-edged sabres; broad, symmetrical bows marks the middle Avar-Bulgar period (670–720).
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.
New regional centers, such as those near Ozora and Igar—county Fehér in Hungary—appeared.
This strengthened the Avars' power base, although most of the Balkans now lay in the hands of Slavic tribes since neither the Avars nor Byzantines were able to reassert control.

A new type of ceramics—the so-called "Devínska Nová Ves" pottery—emerged at the end of the 7th century in the region between the Middle Danube and the Carpathians.
These vessels were similar to the hand-made pottery of the previous period, but wheel-made items were also found in Devínska Nová Ves sites.
Large inhumation cemeteries found at Holiare, Nové Zámky and other places in Slovakia, Hungary and Serbia from the period beginning around 690 show that the settlement network of the Carpathian Basin became more stable in the Late Avar period.
The most popular Late Avar motifs—griffins and tendrils decorating belts, mounts and a number of other artifacts connected to warriors—may either represent nostalgia for the lost nomadic past or evidence a new wave of nomads arriving from the Pontic steppes at the end of the 7th century.
According to historians who accept the latter theory, the immigrants may have been either Onogurs or Alans.
Anthropological studies of the skeletons point at the presence of a population with mongoloid features.

The Khaganate in the Middle and Late periods was a product of cultural symbiosis between Slavic and original Avar elements with a Slavic language as a lingua franca or the most common language.

In the 7th century, the Avar Khaganate opened a door for Slavic demographic and linguistic expansion to Adriatic and Aegean regions.

In the early 8th century, a new archaeological culture—the so-called "griffin and tendril" culture—appeared in the Carpathian basin.
Some theories, including the "double conquest" theory of archaeologist Gyula László, attribute it to the arrival of new settlers, such as early Magyars, but this is still under debate.
Hungarian archaeologists Laszló Makkai and András Mócsy attribute this culture to an internal evolution of Avars resulting from the integration of the Bulgar émigrés from the previous generation of the 670s.
According to Makkai and Mócsy, "the material culture—art, clothing, equipment, weapons—of the late Avar/Bulgar period evolved autonomously from these new foundations".
Many regions that had once been important centers of the Avar empire ha
With the death of Samo, some Slavic tribes again came under Avar rule. The Bulgar Khan Kubrat died in 665 and was succeeded by Khan Batbayan of Old Great Bulgaria. By 670, the Viennese chronicle records that in 677, the "Ungri" (Onogur Bulgar) ethnicon was established decisively in Pannonia.
Following Khan Kubrat's death or a few years later in the time of Bezmer, the empire was dissolved into 5 branches. Two of them (led by Batbayan and Kotrag) were subdued by the emerging Khazar Empire, while the third one led by Asparukh established the Danube Bulgar Empire and stabilized it by the victory at the battle of Ongal. The fourth folk moved to Ravenna while the fifth one, led by Kuber moved into the Avar Khaganate.
According to the Miracles of Saint Demetrius the Avar-Slavic alliance from northern Carpathia forced the Bulgars south out of western Onoguria (Sirmium) at about the same time that the Battle of Ongal took place south of the eastern Carpathians. The new ethnic element marked by hair clips for pigtails; curved, single-edged sabres; broad, symmetrical bows marks the middle Avar-Bulgar period (670–720). 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. New regional centers, such as those near Ozora and Igar—county Fehér in Hungary—appeared. This strengthened the Avars' power base, although most of the Balkans now lay in the hands of Slavic tribes since neither the Avars nor Byzantines were able to reassert control.
A new type of ceramics—the so-called "Devínska Nová Ves" pottery—emerged at the end of the 7th century in the region between the Middle Danube and the Carpathians. These vessels were similar to the hand-made pottery of the previous period, but wheel-made items were also found in Devínska Nová Ves sites. Large inhumation cemeteries found at Holiare, Nové Zámky and other places in Slovakia, Hungary and Serbia from the period beginning around 690 show that the settlement network of the Carpathian Basin became more stable in the Late Avar period. The most popular Late Avar motifs—griffins and tendrils decorating belts, mounts and a number of other artifacts connected to warriors—may either represent nostalgia for the lost nomadic past or evidence a new wave of nomads arriving from the Pontic steppes at the end of the 7th century. According to historians who accept the latter theory, the immigrants may have been either Onogurs or Alans. Anthropological studies of the skeletons point at the presence of a population with mongoloid features.
The Khaganate in the Middle and Late periods was a product of cultural symbiosis between Slavic and original Avar elements with a Slavic language as a lingua franca or the most common language.
In the 7th century, the Avar Khaganate opened a door for Slavic demographic and linguistic expansion to Adriatic and Aegean regions.
In the early 8th century, a new archaeological culture—the so-called "griffin and tendril" culture—appeared in the Carpathian basin. Some theories, including the "double conquest" theory of archaeologist Gyula László, attribute it to the arrival of new settlers, such as early Magyars, but this is still under debate. Hungarian archaeologists Laszló Makkai and András Mócsy attribute this culture to an internal evolution of Avars resulting from the integration of the Bulgar émigrés from the previous generation of the 670s. According to Makkai and Mócsy, "the material culture—art, clothing, equipment, weapons—of the late Avar/Bulgar period evolved autonomously from these new foundations". Many regions that had once been important centers of the Avar empire ha
Pannonian Avars