 The descendant of Glad was Ahtum, another local duke of Banat, the last ruler who opposed to the establishment of the Kingdom of Hungary in the 11th century.The important local Bulgaro-Slavic duke was also Sermon, a vassal of the Bulgarian emperor Samuil, who ruled over Srem in the 11th century.Parts of Vojvodina were conquered by the Kingdom of Hungary between the 10th and 12th centuries.