After a long and unsuccessful siege a certain priest, named Anastasius, by means of an arrow shot from the town, informed the Prince that the fate of the besieged depended upon his cutting off the aqueducts, which supplied them with water. Vladimir in great joy made a vow that he would be baptized if he gained possession of the town; and he did gain possession of it. Then he sent to Constantinople to demand from the Greek Emperor the hand of their sister Anna, and they in answer proposed as a condition that he should embrace Christianity; for though they themselves desired an alliance with so powerful a prince, they at the same time took care to follow the prudent and pious policy of their predecessors, who had ever sought to bring their fierce neighbors under the humanizing influence of the faith. The Prince declared his consent; because, in his own words, he had "long since examined and conceived a love for the Greek law." It was her faith alone which influenced the princess to sacrifice herself at once for the temporal interests of her own country and for the eternal welfare of a strange people. Accompanied by a venerable body of clergy, she sailed for Cherson, and on her arrival induced the Prince to hasten his baptism. "For it was so ordered," says the pious annalist, "by the wisdom of God, that the sight of the Prince was at that time much affected by a complaint of the eyes, but at the moment that the Bishop of Cherson laid his hands upon him, when he had risen up out of the bath of regeneration, Vladimir suddenly received not only spiritual illumination, but also the bodily sight of his eyes, and cried out, 'Now I have seen the true God!'" Many of the Prince's suite were so struck by his miraculous recovery that they followed his example and were baptized in like manner; and these were doubtless afterward zealous for the introduction of Christianity into their country. The baptism and marriage of Vladimir were both celebrated in the Church of the Most Holy Mother of God; and hence, no doubt, arose his peculiar zeal for the most pure Virgin, to whose honor he afterward erected a cathedral church in his own city of Kieff. In Cherson itself he built a church, in the name of his angel or patron St. Basil; and taking with him the relics of St. Clement, Bishop of Rome, and his disciple Thebas, with church vessels and ornaments and icons, he restored the city to be again under the power of the emperors, and returned to Kieff, accompanied by the princess, their daughter, and her Greek ecclesiastics.