In the same region, but farther north[731], lay also a "Great Hungary," the original seat of those other Ugrian Finns known as Hungarians and Magyars, who followed later in the track of the Bulgars, and like them formed permanent settlements in the Danube basin, but higher up in Pannonia, the present kingdom of Hungary. Here, however, the Magyars had been preceded by the kindred (or at least distantly connected) Avars, the dominant people in the Middle Danube lands for a great part of the period between the departure of the Huns and the arrival of the Magyars[732]. Rolling up like a storm cloud from the depths of Siberia to the Volga and Euxine, sweeping everything before them, reducing Kutigurs, Utigurs, Bulgars, and Slavs, the Avars presented themselves in the sixth century on the frontiers of the empire as the unwelcome allies of Justinian. Arrested at the Elbe by the Austrasian Franks, and hard pressed by the Gepidae, they withdrew to the Lower Danube under the ferocious Khagan Bayan, who, before his overthrow by the Emperor Mauritius and death in 602, had crossed the Danube, captured Sirmium, and reduced the whole region bordering on the Byzantine empire. Later the still powerful Avars with their Slav followers, "the Avar viper and the Slav locust," overran the Balkan lands, and in 625 nearly captured Constantinople. They were at last crushed by Pepin, king of Italy, who reoccupied Sirmium in 799, and brought back such treasure that the value of gold was for a time enormously reduced. Then came the opportunity of the _Hunagars_ (Hungarians), who, after advancing from the Urals to the Volga (550 A.D.), had reached the Danube about 886. Here they were invited to the aid of the Germanic king Arnulf, threatened by a formidable coalition of the western Slavs under the redoubtable Zventibolg, a nominal Christian who would enter the church on horseback followed by his wild retainers, and threaten the priest at the altar with the lash. In the upland Transylvanian valleys the Hunagars had been joined by eight of the derelict Khazar tribes, amongst whom were the _Megers_ or _Mogers_, whose name under the form of _Magyar_ was eventually extended to the united Hunagar-Khazar nation. Under their renowned king Arpad, son of Almuth, they first overthrew Zventibolg, and then with the help of the surviving Avars reduced the surrounding Slav populations. Thus towards the close of the ninth century was founded in Pannonia the present kingdom of Hungary, in which were absorbed all the kindred Mongol and Finno-Turki elements that still survived from the two previous Mongolo-Turki empires, established in the same region by the Huns under Attila (430-453), and by the Avars under Khagan Bayan (562-602).