A group of ganadevas. They became devas by meditation. As per Mahabharata Anushasanaparva Chapter 137 verse 25, they were revered by even the other devas.

Angiras, son of Brahma, had a son named Sudhanva. Sudhanva had 3 sons – Ribhu, Vidwa, Vaja. Their group was named Ribhus as per Rigveda Mandala 1 Anuvaka 16 Sukta 111.

Once a brahmin’s cow died, and its calf began to cry. The brahmin prayed to the Ribhus who created a cow, gave it the dead cow’s skin and brought it near the calf. The calf believed it to be its mother.  As per Rigveda Mandala 1 Anuvaka 16 Sukta 11, the Ribhus transformed pious old people into young men and women. The Rigveda also mentions that the Ribhus created the Ashwinis’ chariot, Brihaspati’s cow and Indra’s horses.