Next to the Apadana, the second largest building of the Persepolis Terrace is the Throne Hall (also called the “Hundred-Column Hall”), which was started by Xerxes and completed by his son Artaxerxes I (end of the fifth century B.C.). Its eight stone doorways are decorated on the south and north with reliefs of throne scenes and on the east and west with scenes depicting the king in combat with monsters. In addition, the northern portico of the building is flanked by two colossal stone bulls. In the beginning of Xerxes’ reign the Throne Hall was used mainly for receptions for representatives of all the subject nations of the empire. Later, when the Treasury proved to be too small, the Throne Hall also served as a storehouse and, above all, as a place to display more adequately objects, both tribute and booty, from the royal treasury. Concerning this, Schmidt wrote of the striking parallel in a modern example of a combined throne hall and palace museum where the Shah of Iran stores and exhibits the royal treasures in rooms and galleries adjoining his throne hall in the Gulistan Palace at Teheran.