Aryaman (अर्यमन्, pronounced as "aryaman"; nominative singular is aryama) is one of the early Vedic deities. His name signifies "bosom friend", "play-fellow" or "companion". He is the third son of Aditi, the mother of the Adityas. In the RigVeda Aryaman is described as the protector of mares, and the Milky Way (aryamṇáḥ pánthāḥ) is said to be his path. Aryaman is commonly invoked together with Varuna-Mitra, Bhaga, Bṛhaspati, and other Adityas and Asuras. According to Griffith, the Rig Veda also suggests that Aryaman is a supreme deity alongside Mitra and Varuna. 
The Hindu marriage oaths are administered with an invocation to Aryaman being the witness to the event.