In research up to now, it was thought that the twenty-five historical holy places of St. Honen's activities were established and pilgrimage developed only by the effort of the priest Reitaku. However, in Reitaku's own “ Guide book to twenty-five historical holy places related to the great master Enko ” it is recorded that concerning the choice of the pilgrimage temples and the way of numbering the temples he inevitably followed the suggestion of Osaka-ko. Osaka-ko was a group of pilgrims and their leader was a merchant from Osaka. Osaka-ko donated pictures of St. Honen and pilgrim songs to the temple, published books of pilgrim songs and erected many memorial stones and signposts. In this way, Osaka-ko contributed to the establishment of the twenty-five historical holy places of St. Honen's activities and to the development of this pilgrimage.