User: Who was the most prolific religious leader ever?
Assistant: Some know him as Zoroaster and others as Zarathustra. He lived between the 18th and 16th century BCE. The reputed founder of Zoroastrianism, he started the major religion of the Persian Empire. This empire flourished from 550 BCE to 330 BCE.

Nobody knows his birthplace. But many Arabic sources claim he got born in modern Azerbaijan. To this day, so many countries have tried to lay claim to his birthplace, that we might think he was not a single person.

Followers worshiped Ahura Mazda, the Supreme Being or God of Zoroastrianism. While the religion has gone extinct, we have to note it influenced so many ancient civilizations. Zoroastrianism influenced Classic Greek philosophy, Roman teachings, and many more.

There are still some people practicing Zoroastrianism, namely in India.