Much of the prince’s life was embellished by the legends of the early chronicles and epics have colored the liturgical texts. Tradition relates that he sent envoys to observe the organized religions of his prominent neighbors. What they experienced in Constantinople has remained a by-word for Orthodox liturgy. After attending services in Hagia Sofia, they reported to Vladimir: “We did not know whether we were in heaven or on earth!” In 988 a mass baptism was held in the Dnieper River by command of the prince, and Greek and Bulgarian missionaries began to spread the Gospel throughout Kievan Rus’.