Bulgarian lands across the Danube
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In the Middle Ages the Bulgarian Empire controlled vast areas to the north of the river Danube from its establishment in 681 to its fall in 1396. These lands were called by contemporary Byzantine historians Bulgaria across the Danube. Original information for the centuries-old Bulgarian rule there is scarce as the archives of the Bulgarian rulers were destroyed and little is mentioned for this area in Byzantine or Hungarian manuscripts.
First Bulgarian Empire
After the disintegration of Great Bulgaria following Khan Kubrat's death in 668 a large group of Bulgars followed the third son of the great Khan, Asparukh, who headed westwards. In the 670's they settled in the area known as the Ongal to the north of the Danube delta. From there Asparukh's cavalry in alliance with local Slavs annually attacked the Byzantine territories in the south. In 680 the Byzantine Emperor Constantine IV lead a large army to face the Bulgars but was defeated in the battle of Ongal and as a result the Byzantines were forced to acknowledge the formation of a new country, the First Bulgarian Empire. The northern border of the country followed the southern slopes of the Carpathian mountains from the Iron Gates and reached the Dneper river to the east.
The Bulgarian's main rivals in the area were the Avars to the west and the Khazars to the east. The latter were a serious threat: after they crushed the resistance of Kubrat's eldest son, Bayan they marched westwards. They waged a war against Asparukh who perished in battle fighting the invaders in 700.
In 803 Krum became Khan. The new energetic ruler pointed his attention to the north-west where Bulgaria's old enemies, the Avars experience difficulties and setbacks against the Franks under Charlemagne. Between 804 and 806 the Bulgarian armies militarily annihilated the Avars and destroyed their state. Krum took the eastern parts of the former Avar Khaganate and took over rule of the local Slavic tribes. Bulgaria's territory extended twice from the middle Danube to the north of Budapest to the Dnester though possession of Transylvania is debatable.
There is evidence that the Second Bulgarian Empire ruled at least nominally the Wallachian lands up to the Rucăr–Bran corridor as late as the late 14th century. In a charter by Radu I, the Wallachian voivode requests that tsar Ivan Alexander of Bulgaria order his customs officers at Rucăr and the Dâmboviţa River bridge to collect tax following the law. The presence of Bulgarian customs officers at the Carpathians indicates a Bulgarian suzerainty over those lands, though Radu's imperative tone hints at a strong and increasing Wallachian autonomy.
- Павлов, Пламен. "За северната граница на Второто българско царство през XIII-XIV в." (in Bulgarian). LiterNet. Retrieved 2009-10-08.
- Petăr Koledarov, Političeska geografija na srednovekovnata bălgarska dăržava, vol. 1, Sofija 1979.
- Vasilka Tăpkova-Zaimova, "Roljata i administrativnata organizacija na t. nar. 'otvăd-dunavska Bălgarija'" in Studia Balcanica: proučvanija po slučaj vtorija meždunaroden kongres po balkanistika, Sofija 1970.
- Ian Mladjov, "Trans‐Danubian Bulgaria: Reality and Fiction", in Byzantine Studies/Etudes Byzantines, n.s. 3, 1998 , 85–128.