According to "Azuma Kagami," Yoshitsune invoked the wrath of Yoritomo because he accepted the title from the court without asking for Yoritomo's previous permission and he acted arbitrarily without obeying the instructions of Kagetoki KAJIWARA, who was sent to Yoshitsune by Yoritomo as the military supervisor for the pursuit of the Taira clan.
義経が頼朝の怒りを買った原因は、『吾妻鏡』によると許可なく官位を受けたことのほか、平氏追討にあたって軍監として頼朝に使わされていた梶原景時の意見を聞かず、独断専行で事を進めたこと。