The early Hungarians transformed this region significantly by clearing large areas of forest to make way for pastures and farmland. Approximately 5 to 6 square kilometres of forest were cleared for the construction of the Szabolcs earthwork in the ninth and tenth centuries, and its ruins are still present. The area was the gateway for the Mongol invasion of Hungary in the 1240s, and suffered considerable destruction and population decrease during the raids. With the subsequent development of the country, the region became even more marginalized in the 15th century. Ongoing civil war, rebellion, and war exacted a heavy price and further hindered the region's development.
