Béla IV of Hungary was a king who ruled from 1235 to 1270. He is best known for his efforts to rebuild Hungary after the devastating Mongol invasion in 1241. Béla implemented various reforms to strengthen the kingdom and improve its defenses, which helped stabilize the region. During his reign, Béla IV also encouraged the settlement of foreign populations, including German and Slavic communities, to boost the economy and enhance cultural diversity. His leadership laid the groundwork for Hungary's future development and resilience against external threats.