Bihar
Bihar was an early administrative county of the Kingdom of Hungary, centered first on the earthwork castle at present-day Biharia and later on Nagyvárad, later Oradea. Its land crossed the upper Körös rivers, joining the Pannonian Plain to the mountain valleys of Transylvania. Wet meadows and oak woods covered the lowland, while the eastern valleys opened routes through the Apuseni Mountains.
The fortress at Bihar was the center of Menumorut’s duchy when Hungarian forces entered the Carpathian Basin in the 890s. Earth ramparts enclosed a rectangular stronghold near the Berettyó, and the site became the first seat of the county founded in the eleventh century. The bishop’s residence later moved to Várad, where the shrine of Saint Ladislaus drew pilgrims and royal gifts.
Slavic place names, Hungarian tribal names and warrior graves show that several communities occupied the river corridors. Pecheneg and Ouz raids in 1068 tested the county’s defenses, and local troops later served in royal conflicts. Fortified churches, market villages and river crossings knit the plain and mountains together. Bihar’s identity rested on control of those routes and on the ecclesiastical authority radiating from Várad.