In 15th-century Hungary, some people adopted the surname "Besenyö" (Hungarian for "Pecheneg"); they were most numerous in the county of Tolna. One of the earliest introductions of Islam into Eastern Europe came about through the work of an early 11th-century Muslim prisoner who was captured by the Byzantines. The Muslim prisoner was brought into the Besenyő territory of the Pechenegs, where he taught and converted individuals to Islam. In the late 12th century, Abu Hamid al Garnathi referred to Hungarian Pechenegs – probably Muslims – living disguised as Christians. In the southeast of Serbia, there is a village called Pečenjevce founded by Pechenegs. After war with Byzantium, the broken remnants of the tribes found refuge in the area, where they established their settlement.