Vishtaspa

Vishtaspa was the ancient King of Persia-India. He is mentioned in several major Puranas and minor Puranas, probably even in Valmiki's Ramayana. He is presumed to have lived around 750 B.C. probably before Gautama Buddha was born. He has been mentioned in Jain shastras such as Kalpasutra .

Vishtaspa received Zarathushtra (Zoroaster) in his court and proclaimed his teachings, much the same way as Ashoka, the Great did 500 years later for Buddha's teachings.