West Slavs
The [[Principality of Hungary]] established in 895 by the [[Magyars]] and neighboring [[West Slavs]] was centred on the plain and included almost all of it (as did the former [[Avar Khaganate|Avar Kingdom]]). It was established as the [[Christianity|Catholic]] [[Kingdom of Hungary]] in AD 1000, with the coronation of [[Stephen I of Hungary]].