Cyrus the Great Day
Cyrus the Great Day (Persian: روز کوروش بزرگ Rūz-e Kuroš-e Bozorg) is an unofficial holiday in Iran. Secular and nationalist in nature, it commemorates the legacy of Cyrus II of Persia, who founded the Achaemenid Empire in the 6th century BCE. It is observed annually on the 7th of Aban on the Iranian Solar Hijri calendar, thus corresponding to a date between 28 and 31 October on the international Gregorian calendar.