André de Longjumeau
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André de Longjumeau (also known as Andrew of Longjumeau in English) was a 13th century Dominican missionary and diplomat and one of the most active Occidental diplomats in the East in the 13th century. He led two embassies to the Mongols: the first carried letters from Pope Innocent IV and the second bore gifts and letters from Louis IX of France to Güyük Khan. Well acquainted with the Middle-East, he spoke Arabic and "Chaldean" (thought to be either Syriac or Persian).
Mission for the Holy Crown of Thorns 
Andrew's first mission to the East was when he was asked by the French king Louis IX to go and fetch the Crown of Thorns which had been sold to him by the Latin Emperor of Constantinople Baldwin II in 1238, who was anxious to obtain support for his tottering empire. Andrew was accompanied on this mission by brother Jacques.
Papal Mission to the Mongols (1245–1247) 
Andrew of Longjumeau led one of four missions dispatched to the Mongols by Pope Innocent IV. He left Lyon in the spring of 1245 for the Levant. He visited Muslim principalities in Syria and representatives of the Nestorian and Jacobite churches in Persia, finally delivering the papal correspondence to a Mongol general near Tabriz. In Tabriz, André de Longjumeau met with a monk from the Far East, named Simeon Rabban Ata, who had been put in charge by the Khan of protecting the Christians in the Middle-East.
Second Mission to the Mongols (1249–1251) 
At the Mongol camp near Kars Andrew had met a certain David, who in December 1248 appeared at the court of King Louis IX of France in Cyprus. Andrew, who was now with Saint Louis, interpreted David's message to the King, a real or pretended offer of alliance from the Mongol general Eljigidei, and a proposal of a joint attack upon the Islamic powers of Syria.
In reply to this the French sovereign dispatched Andrew as his ambassador to Güyük Khan; with Longjumeau went his brother William (also a Dominican) and several others — John Goderiche, John of Carcassonne, Herbert "Le Sommelier," Gerbert of Sens, Robert (a clerk), a certain William, and an unnamed clerk of Poissy.
The party set out on 27 January 1249, with letters from King Louis and the papal legate, and rich presents, including a chapel-tent, lined with scarlet cloth and embroidered with sacred pictures. From Cyprus they went to the port of Antioch in Syria, and thence traveled for a year to the Khan's court, going ten leagues (55.56 kilometers) per day. Their route led them through Persia, along the southern and eastern shores of the Caspian Sea, and certainly through Talas, north-east of Tashkent.
On arrival at the supreme Mongol court — either that on the Imyl river (near Lake Alakol and the present Russo-Chinese frontier in the Altai), or more probably at or near Karakorum itself, south-west of Lake Baikal — Andrew found Güyük Khan dead, poisoned, as the envoy supposed, by Batu Khan's agents. The regent-mother Oghul Qaimish (the "Camus" of William of Rubruck) seems to have received and dismissed him with presents and a letter for Louis IX, the latter a fine specimen of Mongol insolence. But it is certain that before the friar had quit "Tartary" Möngke, Güyük's successor, had been elected.
Andrew's report to his sovereign, whom he rejoined in 1251 at Caesarea in Palestine, appears to have been a mixture of history and fable; the latter affects his narrative of the Mongols' rise to greatness, and the struggles of their leader Genghis Khan with Prester John; it is still more evident in the position assigned to the Mongols' homeland, close to the prison of Gog and Magog. On the other hand, the envoy's account of Mongol customs is fairly accurate, and his statements about Mongol Christianity and its prosperity, though perhaps exaggerated (e.g. as to the 800 chapels on wheels in the nomadic host), are based on fact.
Mounds of bones marked his road, witnesses of devastations which other historians record in detail. He found Christian prisoners from Germany in the heart of "Tartary" (at Talas), and was compelled to observe the ceremony of passing between two fires, as a bringer of gifts to a dead Khan, gifts which were of course treated by the Mongols as evidence of submission. This insulting behaviour, and the language of the letter with which Andrew reappeared, marked the mission a failure: King Louis, says Joinville, "se repenti fort" ("felt very sorry").
Andrew died some time after 1253, while he was active as a missionary in Palestine. The Franciscan missionary, William of Rubruck, in his work on Asian customs, declares that everything he had heard from Andrew on the subject was fully borne out by his own personal observations.
We only know of Andrew through references in other writers: see especially William of Rubruck's in Recueil de voyages, iv. (Paris, 1839), pp. 261, 265, 279, 296, 310, 353, 363, 370; Joinville, ed. Francisque Michel (1858, etc.), pp. 142, etc.; Jean Pierre Sarrasin, in same vol., pp. 254–235; William of Nangis in Recueil des historiens des Gaules, xx. 359–367; Rémusat, Mémoires sur les relations politiques des princes chrétiens… avec les… Mongols (1822, etc.), p. 52.
See also 
- Giovanni da Pian del Carpine
- Lawrence of Portugal
- Ascelin of Lombardia
- Simon of St Quentin
- Exploration of Asia
- Franco-Mongol alliance
- Roux, "Les explorateurs", p.96
- Gregory G. Guzman, "Simon of Saint-Quentin and the Dominican Mission to the Mongol Baiju: A Reappraisal" Speculum, Vol. 46, No. 2. (April., 1971), p. 235.
- Igor de Rachewiltz, Papal Envoys to the Great Khans (Stanford University Press, 1971), p. 113.
- Richard, "Histoire des Croisades", p.376
- Roux, Jean-Paul, Les explorateurs au Moyen-Age, Fayard 1985, ISBN 2-01-279339-8
- Richard, Jean, Histoire des Croisades, Fayard, ISBN 2-213-59787-1