Béla IV of Hungary

Béla IV of Hungary, born on November twenty-ninth, twelve hundred six, was a prominent monarch who ruled as King of Hungary and Croatia from twelve thirty-five to twelve seventy. As the eldest son of King Andrew II, Béla was crowned in twelve fourteen, despite his father's strong opposition. Initially denied a province to govern, he was appointed Duke of Slavonia in twelve twenty, which included jurisdiction over Croatia and Dalmatia. His marriage to Maria, daughter of Theodore I Laskaris, Emperor of Nicaea, further solidified his political alliances.

Upon the death of his father in September of twelve thirty-five, Béla ascended to the throne with the aim of restoring royal authority that had waned during his father's reign. He undertook significant reforms, revising land grants and reclaiming royal estates, which led to discontent among the nobility. His reign faced a severe challenge when the Mongols invaded Hungary, culminating in the disastrous Battle of Mohi on April eleventh, twelve forty-one, where Béla's forces were decimated. Although he managed to escape, the Mongol invasion left the kingdom in ruins.

In response to the devastation, Béla implemented radical reforms to fortify his kingdom against future invasions. He permitted the construction of stone fortresses and the establishment of private armed forces by barons and prelates. His efforts attracted thousands of colonists from the Holy Roman Empire and Poland, aiding in the repopulation of the ravaged lands. This period of rebuilding earned him the title of the 'second founder of the state' in Hungary.

Béla also forged a defensive alliance against the Mongols, collaborating with various princes from Ruthenia and Poland. His military endeavors included the occupation of the Duchy of Styria in twelve fifty-four, although it was lost to King Ottokar II of Bohemia six years later. The establishment of a buffer zone along Hungary's southern frontier during the twelve fifties further exemplified his strategic governance.

Despite his achievements, Béla's relationship with his eldest son, Stephen, became strained in the early twelve sixties, leading to a civil war that lasted until twelve sixty-six. Nevertheless, Béla's legacy is marked by his piety, as he died a Franciscan tertiary, and the veneration of his three saintly daughters—Kunigunda, Yolanda, and Margaret—was recognized by the Holy See.