A very ancient monotheistic religion, and Cyrus the Great of Persia was the one who really spread Zoroastrianism. And he's considered a messiah amongst the Jewish people because he liberated them from the Babylonian captivity, helped them resettle in Jerusalem, and helped rebuild the temple at Jerusalem. Zoroastrianism also has ties to Islam. Zoroastrians pray five times a day, just like Muslims. They have the ritual bathing before the prayer, just like Muslims, at the same time of day. So once again, amongst all of these religions, they definitely came in contact with each other, and you definitely have ideas that are shared amongst the religions. So with that, I'll leave you with one last quote from Guru Nanak.