>>21537
Something is certainly amiss which we have no real information about.
Judging by his previous actions I have no reason to assume he really wanted to take over the country and he was a danger to the child king László.
The Árpáds might be we could also called it Turulids themselves were considered a sacred dynasty, kind of a holy cows liek the Merovings were in Franca. The country could only had a king from that dynasty, which title was inherited exclusively on the male line. Noone would have accepted the duke as a new king - unless in case of the death of all the Árpáds beside László, there was one more abroad, who finally became king as Andrew III, and was actually the last one. Maybe he had ambitions to be a governor but nevertheless back then he supported the senior king, but accepted the junior when the old died, which means he was devoted to keep the lawful order I believe he would supported the child king too.
The royal power continuously waned in the 13th century as the lords gained more and more lands and by the end certain aristocrats could rule over territories which were essentially countries on their own. Henrik of Kőszeg was the first among these oligarchs. They didn't know honor and fealty, they cared only about their own gains. Henrik had no qualms to give several castles of the country to Otakar when he decided he won't kneel before István V as duke Béla did, Henrik wasn't scrupulous when he helped Otakar to attack his lawful king. These type of guys just wished to push the country into such feudal anarchy which characterized the HRE at that time, very little central power, all the landholders are their own lord. Duke Béla however doesn't seemed to be like that.
One typical example of the weakness of royal power and lack of respect, that previously that year, one aristocrat kidnapped the heir of István V and held him captive in one of his castle. The king laid siege on the castle and during that he fell ill and died. Suddenly. How convenient. Here also can be suspected foul play.
Over the child king another noble league held influence, the queen mother was their pawn. I believe the court lacked in people who held lot of sympathy toward Béla. Tho he must had his own retainers bodyguards around, he sure didn't travel alone. Maybe he was ambushed leaving a place where he couldn't bring them with himself, or was accused of treason, and held down while his men tried to decide what to do, or they were also overpowered. There's zero information about the particularities
Sources say several men attacked him, one says it was Henrik alone, but another says that Henrik advised the attack and helped to execute it, the thirs says generally that they were Hungarian nobles. Based on the second we could assume the deed was planned beforehand, maybe they invited to the court where duke Béla could hope he'll be safe.
Who knows. We won't ever.