Trita Aptya
An ancient god of the Rigveda with no hymn of his own, mentioned about forty times. With his father's weapons he kills the three-headed son of Tvashtri and frees the cattle, deeds also given to Indra; he rends Vritra and breaks Vala's fences; he presses Soma; bad dreams and hidden faults are sent away to him; and one hymn (1.105) shows him calling from a well until Brihaspati frees him. The Shatapatha Brahmana makes him one of three Aptya brothers born from the waters Agni spat upon, on whom the guilt of Vishvarupa's killing is wiped. In the Mahabharata he is a human sage, son of Gautama, left in a well by his brothers.
Sources: Hymns of the Rigveda, tr. R. T. H. Griffith (1896), hymns read for the Vedic layer; The Satapatha-Brahmana, tr. Julius Eggeling (Sacred Books of the East 12, 41); The Mahabharata, tr. K. M. Ganguli (1883-96), sections read for the Vedic layer; Vedic Mythology, A. A. Macdonell (1897) · see Trita Aptya's web