Nyíregyháza, the capital of Szabolcs County, was founded around 1750 as a Slovak Lutheran settlement, and had an ethnic Slovak majority until the latter part of the 19th century, when the population became Magyarized. Also, Szabolcs County had a sizeable population of Greek Catholics, who were of Ruthenian and Romanian origin and who became almost entirely Magyarized by the end of the 19th century.
