Of all the things described in William of Rubruck's account of his travels through 13th-century Asia, perhaps none is so striking as the remarkably ornate fountain he encountered in the Mongol capital which — complete with silver fruit and an angelic automaton — flowed with various alcoholic drinks for the grandson of Genghis Khan and guests. Devon Field explores how this Silver Tree of Karakorum became a potent symbol, not only of the Mongol Empire's imperial might, but also its downfall.