ANDREW of LONGJUMEAU. - French Dominican who lived in the 13th century. He was entrusted, along with others, by St. Louis, King of France, to go to Constantinople to obtain the relic of the Holy Crown (1238). Sent by Pope Innocent IV to the "King of the Tartars," he reached Tabriz in Persia, where he made contact with a Mongol leader (1245-47). He accompanied St. Louis on the crusade (1248-54) and was sent by him to the Great Khan of the Mongols, Güyük, whom he found dead (1249-51). St. Louis, on his deathbed, recalled a mission of Brother A. in Tunisia (between 1254 and 1270), otherwise unknown. He knew Arabic and Persian. He left no account of his travels.
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BIBL.:** P. Pelliot, *Les Mongols et la papauté*, in *Revue de l'Orient chrétien*, 23 (1922-23), pp. 3-30; 24 (1924), pp. 225-335; 28 (1931-32), pp. 3-84; (this last article is entirely devoted to Brother A. of Longjumeau); G. Soranzo, *Il papato, l'Europa cristiana e i Tartari*, Milan 1930, passim.
**Raymond Loenertz**