 Among the most famous tsarinas of this period were six or seven wives of Ivan the Terrible, who were poisoned by his enemies, killed or imprisoned by him in monasteries.However, only the first four of them were crowned tsarinas, as the later marriages were not blessed by the Orthodox Church and were considered as cohabitation.Polish noblewoman Marina Mnishek also became tsarina of Russia by her marriage to the impostor False Dmitry I and later to False Dmitri II.