Some of the Böszörmény probably joined the federation of the seven Magyar tribes during the 9th century, and later smaller groups of Muslims arrived in the Carpathian Basin.
Their rights were gradually restricted from the 11th century on, and they were coerced to accept baptism following the establishment of the Christian Kingdom of Hungary.
In the 10th century, Ibrahim ibn Yaqub described the Muslim merchants who arrived in Prague from the territories of the Magyars and traded slaves and tin.
The Gesta Hungarorum recorded that many Muslims arrived in the Carpathian Basin from Volga Bulgaria during the reign of Taksony, Grand Prince of the Magyars (c. 955 – before 972) and they settled down there.
He was entrusted by King Géza II of Hungary to recruit soldiers among the Maghrebians (Böszörmény) living east of the Carpathian Basin.
Their largest communities lived in the southern parts of the Kingdom of Hungary in Syrmia and in region where the Drava joins the Danube.
[2] The Arab geographer Yaqut al-Hamawi mentioned that Muslims from the Kingdom of Hungary were studying in Aleppo in the beginning of the 13th century.
On 3 March 1231, Pope Gregory IX requested the prelates of the kingdom to protest against this practise, and authorized them to use ecclesiastical penalties for this reason.