(*) William of Rubruck led a western embassy to this city in the 1250s, when it was ruled by Mongke.
One structure in this city was a silver tree that dispensed four different kinds of beverages when a bellows-driven angel figure blew on a trumpet. This city's residents included Guillaume Boucher, a goldsmith who was born in Paris, and Paquette, a native of Lorraine who had traveled to this city from Hungary. Some landmarks in this city were an eastern market for the sale of millet, which was "rarely brought" there, and a Nestorian church located at its "extreme end." (*) William of Rubruck led a western embassy to this city in the 1250s, when it was ruled by Mongke. A rectangular mud wall enclosed this city in the Orkhon river valley, whose low permanent population was supplemented by the seasonal movements of nomads who lived in tents called gers. For 10 points, name this city that served as the capital of the Mongol Empire.
One structure in this city was a silver tree that dispensed four different kinds of beverages when a bellows-driven angel figure blew on a trumpet.
Karakorum (or Khara-korin or Holin)