Bela realized that reconstruction would require the magnates' support, so he abandoned his attempts to recover former crown lands. Instead, he granted crown lands to his supporters, reorganized the army by replacing light archers with heavy cavalry, and granted the magnates concessions to redevelop their lands and construct stone-and-mortar castles that would withstand enemy sieges. Bela repopulated the country with a wave of immigrants, transforming royal castles into towns and populating them with Germans, Italians, and Jews. Mining began anew, farming methods improved, and crafts and commerce developed in the towns. After Bela's reconstruction program, the magnates, with their new fortifications, emerged as Hungary's most powerful political force. However, by the end of the thirteenth century, they were fighting each other and carving out petty principalities.

King Bela IV died in 1270, and the Árpad line expired in 1301 when Andrew III, who strove with some success to limit the magnates' power, unexpectedly died without a male heir. Anarchy characterized Hungary as factions of magnates vied for control.

Data as of September 1989