who had a traditional Slavic ruler's title – the "great župan" (rendering veliki župan). Tutorov also speculates that the Treasure of Groß Sankt Nikolaus was probably buried by Buta-ul in 796, when Pippin, the son of Frankish ruler Charlemagne, penetrated with his army into the centre of Avar caganate near the river Tisa. It is assumed that Buta-ul buried his treasure in great hurry before the Frankish army arrived, since the treasure was buried only half metre deep in the ground. See also Banat Buyla History of Vojvodina Rulers of Vojvodina Treasure of Nagyszentmiklós References External links 8th-century rulers in Europe Romania in the Early Middle Ages History of Banat Medieval history of Vojvodina Pannonian Avars 8th century in Serbia