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Andrew Of Lonjumel (flourished 1238–53) was a French Dominican friar who, as an ambassador of Louis IX (St. Louis) of France, led a diplomatic mission destined for the court of the Mongol khan Güyük. His report of the journey across Central Asia and back (1249 to 1251/52), though a mixture of fact and fiction, contains noteworthy observations. On his first diplomatic mission, to Constantinople (1238), he brought back the relic revered as Christ’s crown of...