One of the Jochid princes who joined Hulagu's army was accused of witchcraft and sorcery against Hulagu. After receiving permission from Berke, Hulagu executed him. After that two more Jochid princes died suspiciously. According to some Muslim sources, Hulagu refused to share his war booty with Berke in accordance with Genghis Khan's wish. Berke was a devoted Muslim who had had a close relationship with the Abbasid Caliph Al-Musta'sim, who had been killed by Hulagu in 1258. The Jochids believed that Hulagu's state eliminated their presence in the Transcaucasus. Those events increased the anger of Berke and the war between the Golden Horde and the Ilkhanate soon broke out in 1262.