Aruna Aupaveshi Gautam

Aruna Aupaveshi Gautam was a Brahmin who lived around 700 BC. 

He was the father of Uddalaka Aruni, a scholar from Kuru-Panchala region.^[1][2][3]

Reference

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1. Brihadaranyaka Upanishad 6.3.7
2. http://www.mukhopadhyay.in/2015/09/yajnavalkya.html
3. Encyclopaedia of the Hindu world By Ganga Ram Garg Pg 649 - 650