sentences:  The Mamluk-era historian al-Maqrizi writes that this was due to the machinations of al-Afdal, who had prevented al-Mustansir from making his choice of Nizar public because of a deep-seated enmity between the two men.Reportedly, the vizier had once tried to enter the palace on horseback, whereupon Nizar yelled at him to dismount and called him a "dirty Armenian".Since then, the two had been bitter enemies, with al-Afdal obstructing Nizar's activities and demoting his servants, while at the same time winning the army's commanders over to his cause.