Anna, another daughter of Alexius, was married to Bagrat VI., King of Georgia; and a third daughter was bestowed on Taharten, Emir of Erdsendjan. Alexius's sisters met a similar fate. His sister Maria was married to Koutloubeg, the chief of the great Turkoman horde of the White Sheep; and his sister Theodora, to Hadji Omer, Emir of Chalybia.
These marriages with Mohammedan nobles, though one revolts at the immolation of Christian maidens on the altar of selfish expedience, are yet the strongest proof how the Christian state was being surrounded by powerful Mohammedan chieftains, who must be conciliated to ward off the evil day of extinction. Such alliances, too, may account in part for the moral degradation which henceforth characterizes the house of Grand-Comnenus.
In the next generation, Alexius IV. wedded Theodora Cantacuzenus, of the celebrated Byzantine family of that name. Neglected by her husband, the princess consoled herself with too close an intimacy with one of the chamberlains of the palace; her son John, indignant at his mother's disgrace, assassinated her lover with his own hands. He later murdered his own father, and ascended the throne as John IV.
Under this cruel and intriguing ruler and his successors, the Christian population of the country regarded the dynasty of Grand-Comnenus as a dynasty of pagan or foreign tyrants, so little of religion or morality survived in Trebizond. His alliances with the Turkoman plunderers of the frontiers increased the popular aversion. John early recognized the growing strength of the Turks, and sought to prepare to meet the coming invasion by forming an alliance with Ouzoun Hassan, chief of the Turkomans of the White Horde, whose daring courage and rapid career of conquest made him, in the general estimation, a formidable rival of Mohammed II.
When invited to join in the league against Mohammed, Hassan demanded as the price of his assistance the hand of the emperor's daughter Katherine, renowned throughout the Orient as the most beautiful virgin in the East. John IV. was highly pleased at the prospect of purchasing so powerful an alliance on such easy terms, and readily agreed, doubtless without consulting the fair Katherine. Yet, in order to save his credit as a Christian emperor, and perhaps as a balm to his own conscience in sacrificing his daughter to an infidel, he stipulated in the treaty that Katherine should be permitted always the exercise of her own religion, and should have the privilege of keeping a certain number of Christian ladies as her attendants, and of Greek priests in her suite, to serve a private chapel in the harem. It is to the honor of a Mussulman to observe that Hassan strictly kept his promises, even after the empire of Trebizond and the house of Grand-Comnenus were no more.
Before this matrimonial alliance was fulfilled, John came to his end; but his brother David, who displaced the heir and usurped the throne,--a fit agent for consummating the ruin of an empire,--completed the arrangement. The beautiful Katherine was sent with suitable pomp to the court of her bridegroom, Hassan, and readily adapted herself to the changed conditions of her life. She soon acquired great influence over her infidel husband, who was the soul of honor and good faith, and in every phase of her life which is known to us she showed herself the most attractive character of the whole house of Comnenus.
But no matrimonial alliance could save the doomed empire. Constantinople had fallen in 1453, and it was merely a matter of time when the last surviving Greek kingdom should succumb to the Mohammedan yoke. Mohammed II., by the exercise of intrigue, gradually detached from the emperor his infidel allies. When finally the Mohammedan forces came against the city, David showed that he possessed nothing of the heroic spirit of the last Constantine. He offered but a feeble resistance, and readily sacrificed the city to outrage and plunder on an assurance of safety for himself and his family. David basely deserted his empire and embarked on board one of the Turkish galleys, with his family and his treasures, to enjoy for a brief period luxurious ease in the European appanage assigned him by Mohammed.
David's family consisted of seven sons and a daughter borne him by Helena Cantacuzena, his second wife, who, through her devotion to husband and children, deserves to rank among the noblest of mothers in the chronicles of history.
The dethroned emperor was not long permitted to enjoy the repose he had purchased with so much infamy. Mohammed at length suspected him of carrying on secret communications with Ouzoun Hassan, his niece's husband, and plotting to reestablish the Empire of Trebizond. He was suddenly arrested on his luxurious estate, and conveyed with his whole family to Constantinople. While they were on the way a letter from Despina Katon--the popular designation of the fair Katherine--to her uncle David was intercepted by the Ottoman emissaries. In this the amiable spouse of Hassan, requested David to send her brother, or one of her cousins, to be educated at her husband's court. This letter afforded convincing proof to the suspicious Sultan that David was plotting with Ouzoun Hassan and other enemies of the Porte for the restoration of his empire.
The bare suspicion of Mohammed was a sentence of death to the whole race of Grand-Comnenus. As soon as the unfortunate prisoners reached Constantinople, David was ordered to embrace Islam under pain of death. His life had been ignoble, but in his death David showed that he still possessed something of the nobility of the Comneni, and he chose death rather than dishonor his name by renouncing his religion. David, his seven sons and his nephew Alexius were all slaughtered in one day, in the year 1470: the daughter was lost in a Turkish harem.