text: William of Rubruck (; ; ) or Guillaume de Rubrouck was a Flemish Franciscan missionary and explorer.
  He is best known for his travels to various parts of the Middle East and Central Asia in the 13th century, including the Mongol Empire. His account of his travels is one of the masterpieces of medieval travel literature, comparable to those of Marco Polo and Ibn Battuta.
  Mission
  William was born in Rubrouck, Flanders. In 1248, he accompanied King Louis IX of France on the Seventh Crusade. On 7 May 1253, on Louis' orders, he set out on a missionary journey to convert the Tatars to Christianity. He first stopped in Constantinople to confer with Baldwin of Hainaut, who had recently returned from a trip to Karakorum, the capital of the Mongol Empire, on behalf of Baldwin II, Latin Emperor. There, William received letters to some of the Tatar chiefs from the emperor.