According to most nearly contemporaneous sources, the Hungarians played a prominent role in the fall of Moravia. For instance, Regino of Prüm writes that Svatopluk I's "sons held his kingdom for a short and unhappy time, because the Hungarians utterly destroyed everything in it". The Hungarians started their conquest of the Carpathian Basin after their defeat in the westernmost territories of the Pontic steppes around 895 by a coalition of the Bulgars and Pechenegs. Only a late source, the 16th-century Johannes Aventinus, writes that the Hungarians had by that time controlled wide regions to east of the rivers Hron and Danube in the Carpathian Basin.