The oldest of the historic monuments in Tehran, the Golestan Palace (Palace of Flowers) belongs to a group of royal buildings that were once enclosed within the mud-thatched walls of Tehran’s Historic Arg (citadel). The Arg was built during the reign of Tahmasb I (r. 1524-1576) of the Safavid dynasty (1502-1736), and was later renovated by Karim Khan Zand (r. 1750-1779). Agha Mohamad Khan Qajar (1742-1797) chose Tehran as his capital. The Arg became the site of the Qajar (1794-1925). Court and Golestan Palace became the official residence of the royal family. During the Pahlavi era (1925-1979) Golestan Palace was used for formal royal receptions. The most important ceremonies to be held in the Palace during the Pahlavi era were the coronation of Reza Khan (r. 1925-1941) in Takht-e Marmar and the coronation of Mohammad Reza Pahlavi (r. 1941-deposed 1979) in the Museum Hall.