The presence of Serbs in the territory of present-day Hungary date from the Middle Ages. The mother of the Hungarian king Géza II (1141-1162) was Helena of Serbia, a daughter of Uroš I, ruler of the Grand Principality of Serbia. During the rule of Géza II, her brother Beloš Vukanović was a palatine of the Kingdom of Hungary. When the Magyars arrived to the Pannonian Basin under Arpad in 896, they met there with the already well established Slavic population. This Slavic population however was quickly assimilated or otherwise exterminated. The Serbs who later migrated into the Pannonian Basin from the Balkans, were the descendants of those Slavs who in the 7th century migrated from the Pannonian Basin southwards into the Balkan peninsula.