Bulgarian lands across the Danube

[1][2][3] In the Middle Ages the Bulgarian Empire controlled vast areas to the north of the river Danube (with interruptions) from its establishment in 681 to its fragmentation in 1371-1422.

The new energetic ruler pointed his attention to the north-west where Bulgaria's old enemies, the Avars, experienced difficulties and setbacks against the Franks under Charlemagne.

Bulgaria's territory extended twice from the middle Danube to the north of Budapest to the Dnester though possession of Transylvania is debatable.

The relocated population managed to maintain social cohesion in their new lands and even had its own governor named Kordylas.

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.