The mythical flag of Kaveh (a Blacksmith) was a symbol of Iran in ancient times, from the Pishdadian and Kianian eras to the end of the Sasanian Empire. According to Ferdowsi's Shahnameh, this flag emerged when Kaveh the Blacksmith stood up against the tyrant Zahhak and the reign of Feridoun began. The Kavian flag had hanging ribbons in red, yellow, blue, and purple colors, with a star (planet) shape in the middle. That's why it's also known in some sources as the Kavian Star.