Start of Persepolis Construction, Farvardin 1. This date in the Shahanshahi calendar marks the commemoration of the beginning of construction of the historical complex of Persepolis. Persepolis was initiated during the Achaemenid era by the order of Darius I and is considered one of the most significant architectural and artistic achievements of ancient Iran. The construction began around the 5th century BCE and continued for several decades under the rule of Darius’s successors. Persepolis served as the ceremonial and political center of the Achaemenid Empire, hosting official gatherings and celebrations. The complex includes palaces, halls, and bas-reliefs that depict historical and cultural events of the period. The construction involved the use of massive stones and high-quality materials, with architecture that blended Iranian artistry and elements from neighboring civilizations. Today, Persepolis is recognized as a World Heritage site, attracting many visitors from around the globe each year. The inclusion of the start of Persepolis construction in the Shahanshahi calendar highlights the historical and cultural significance of this site for Iranians and its role in shaping national identity.