Sandipani

In Hindu mythology, Sandipani, also Sandipani Muni (Sandīpanī Muni), was the guru of Krishna. It is said that he was from modern-day Ujjain,[1] then known as Avantika.

Shree Krishna Sandipan Dakshina, Ravi Varma Press

The Bhagavata Purana relates the following story regarding Sandipani:[2] While staying as students at the residence of Sandipani Muni, the two brothers Krishna and Balarama, and their friend, Sudama, mastered every single lesson, although only having been instructed in each once. Upon the rapid completion of their studies, they persuaded their teacher to ask for the preceptor’s dakṣiṇā (a type of honorarium to one's guru) of his own choosing. Sandipani asked for the restoration of his child, who had disappeared in the ocean at Prabhas (on the western coast of modern Gujarat, close to the Somnath temple). The two brothers travelled to Prabhas and found that the son had been snatched away by a being named Śaṅkhāsura (lit. 'conch demon'); in the Mahābhārata, Śaṅkha is mentioned as one of Kubera's treasures, as well as the being presiding over it).