Sanaka, Sanandana,
and Sanatana are the other three sages born by the deity Brahma who are par
adigms of asceticism in Hindu mythology.
When Brahma manifests these four sages, he tells them to begin
the job of creation, but they reject since they are so separated from mundane
concerns.
They have lived a life of celibacy, have studied the Vedas
from infancy, and constantly travel together.