When we think about Iran and its religion the first thing that will come to our minds is going to be, probably, Islam. Although that’s a reasonable reaction, being the country currently a Theocratic Islamic Republic, Iran is actually the birthplace of one of the oldest religions of the world that is still active: Zoroastrianism.
Zoroastrianism takes its name from Zoroaster or Zarathustra, the Iranian prophet whose teachings of the religious traditions of the religion helped its development and expansion. There is no scholarly consensus about when he was born, but there are evidences pointing at somewhere between the 1st and the 2nd millennium BCE (3,000 or 4,000 years ago). Other scholars, however, put him way later, on the 6th century BCE, as a contemporary of Cyrus the Great and Darius I. On top of that we are not even sure if he was just one man or a series of prophets and masters, being the Zoroaster we know one of them. In any case, his main contribution to Zoroastrianism was the creation of what became the core of Zoroastrian thinking and liturgy. He, according to the legend, created the Avesta, the holy book of Zoroastrianism.