 The territories of Wallachia and Moldavia were under the control of the First Bulgarian Empire from its establishment in 681 until around the time of the Hungarian conquest of Transylvania at the end of the 10th century.After the disintegration of Great Bulgaria following Khan Kubrat's death in 668, a large group of Bulgars followed Asparukh, the third son of the great Khan, who headed westwards.In the 670's they settled in the area known as the Ongal to the north of the Danube delta.