This paper aims to clarify the qualities of the Life of Saint Basil the Younger created in the10th century Constantinople in Byzantium, using the usual literary image "topos" as a criterion foranalysis. Overviewing the topos of the Greek hagiography from the Early Byzantine period to the Middle Byzantine period, those from the Middle Byzantine period onward show conspicuous deviations from the traditional topos. In particular, the Life of Saint Basil the Younger is regarded as a representative example that has deviations from the topos among the hagiographies in the 10th century. In this hagiography, the portrayal of the saint tends to recede into the background. Instead, ‘Narrative of Other Worlds’ makes up the bulk of the story: The vision of Last Judgement of author Gregory and the passage through the celestial tollhouses after the death of slave Theodora. Based on these characteristics, this paper analyzes the Life of Saint Basil the Younger from various aspects, with reference to the hagiographical topos in the 10th century. In conclusion, the author has an original worldview, using the form of hagiography to develop the narratives from the viewpoint of laymen. In addition, the worldview of the afterlife from the laymen in the Life of Saint Basil the Younger would have encouraged the acceptance of those narratives by a large audience in Byzantium and beyond.