The plot to assassinate Nikephoros began when he dismissed Michael Bourtzes from his position following his disobedience in the siege of Antioch. Bourtzes was disgraced, and he would soon find an ally with whom to plot against Nikephoros. Towards the end of 965, Nikephoros had John Tzimiskes exiled to eastern Asia Minor for suspected disloyalty, but was recalled on the pleading of Nikephoros' wife, Theophano. According to Joannes Zonaras and John Skylitzes, Nikephoros had a loveless relationship with Theophano. He was leading an ascetic life, whereas she was secretly having an affair with Tzimiskes. Theophano and Tzimiskes plotted to overthrow the emperor. On the night of the deed, she left Nikephoros' bedchamber door unlocked, and he was assassinated in his apartment by Tzimiskes and his entourage on 11 December 969. Following his death, the Phokas family broke into insurrection under Nikephoros' nephew Bardas Phokas, but their revolt was promptly subdued as Tzimiskes ascended the throne.