Who was the great saint that left the Godavari's banks to appear on the Krishna river for the world's upliftment?

The great saint mentioned in Chapter 4 who moved from the Godavari to the Krishna river is Saint Ramdas. The text notes that he made this journey "for the upliftment of the world." This example is then used as a direct parallel to Sai Baba's own appearance on the Godavari. Just as Saint Ramdas had a divine mission to uplift humanity, Sai, the "Lord of Yoga," is presented as having appeared in Shirdi for a similar divine purpose, making the region spiritually potent through his holy presence.