Vlachia was a country at the site of OTL southern Romania. Since 1240, Christianized Volga Hungarians settled down in Hungary proper, mostly in the Banat (western Vlachia). Vlachia and Moldavia became part of the Hungarian sphere of influence. During 1383-87, the Rum-Seljuks crossed the Danube, defeated the Hungarians several times, took control of Vlachia, which became a part of their empire.