International Association for Danube Research the Danube. In a more recent branch of IAD in Austria, the ÖK (Österreichisches Komitee), scientists with outstanding research related to the Danube Basin in Austria are awarded with the “Liepolt-Preis”. The major achievement in the first decade of IAD was the monograph “Limnologie der Donau” (Limnology of the Danube), edited by Liepolt and published by E. Schweizerbart’sche Verlagsbuchhandlung (Nägele & Obermiller) Stuttgart in 1967. In the same year, the Commission for Hydrology of the Romanian Academy published the monography “Limnology of the Romanian sector of the Danube”. In 1986, S. Godeanu and V. Popescu-Marinescu released the bibliography “Limnologie der
Bulgarian lands across the Danube Bulgarian lands across the Danube 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. 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. After the disintegration of Great Bulgaria following Khan Kubrat's death in 668 a large group of Bulgars followed the third son of the