Vasishtha

The ''Yoga Vasishtha'', ''Vasishtha Samhita'', as well as some versions of the ''Agni Purana'' and ''Vishnu Purana'' are attributed to him. He is the subject of many stories, such as him being in possession of the divine cow Kamadhenu and Nandini her child, who could grant anything to their owners. He is famous in Hindu stories for his legendary conflicts with sage Vishvamitra. In the Ramayana, he was the family priest of the Raghu dynasty and teacher of Rama and his brothers. Provided by Wikipedia
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