He returned to his homeland upon the invitation of his brother Andrew, who had in the meantime been crowned King of Hungary. Andrew assigned the administration of the so-called "ducatus" or "duchy", which encompassed around one-third of the territory of the Kingdom of Hungary, to Béla. The two brothers' relationship became tense when Andrew had his own son, Solomon, crowned king, and forced Béla to publicly confirm Solomon's right to the throne in 1057 or 1058. Béla, assisted by his Polish relatives, rebelled against his brother and dethroned him in 1060. He introduced monetary reform and subdued the last uprising aimed at the restoration of paganism in Hungary. Béla was fatally injured when his throne collapsed while he was sitting on it.