Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot
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Contact was renewed by Sassanid history: in the5th century, Wahrām v, on the occasion of his campaigns against the nomads of the north-east, who were becoming restless again, temporarily extended his domination over part of the left bank (although there is as yet no archaeological confirmation). The local "Afrighide" dynasty is attested retrospectively from the early 4th century. In 570, a Byzantine embassy to the Turks passed through Khorezm and mentioned it. Chinese sources, for their part, only mention the nomadic confederations to the north and east of Khorezm: Kangju (in Kazakhstan) and Yentsai (the Alans of the lower Syr-darya); Khorezm as such only appears in the 7th c., as an appendage of Sogdiana.

The Arab conquest came in 712. The Afrighide dynasty, which had accepted Islam, survived until 995, but its former capital, Kath, gradually fell into the Amu-darya; the Muslim governor resided on the other bank at Urgench, which became one of the main cities of the Eastern caliphate. The country maintained trade relations with the Khazars and Slavs (the old Russian word for "Muslim", busurman, is Chorasmian). It exported its products (the name of organdi fabric comes from Urgench), as well as great scholars: al-Khwārizmi, who gave his name to algorithms; al-Biruni, the only person to have written about his country's traditions, by his own admission, in order to rescue from oblivion what could still be forgotten. In his Chronologie, we owe him a list of the ancient kings, a presentation of the calendar and festivals; in his Nihāyat, a remarkably accurate reconstruction of the geological process of the displacement of the Amu-darya delta, supported by the discovery of fossils ("fish ears").

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