Kara-Khanid scholar Mahmud al-Kashgari wrote that Basmyls spoke their own language besides Turkic.

[5] "They are handsomer men than the other natives of the country, and having more ability, they come to have authority; and they are also capital merchants.

"[9] Kashgari mentioned an urban Argu people who spoke Middle Turkic with "a certain slurring (rikka)", like people of Sogdak and Kenchek;[10] Golden proposes that the Arghu were Iranian speakers undergoing Turkicization.

"[12] The name of the Argyns probably corresponds to that of the "Argons" mentioned by Marco Polo in a country called "Tenduc" (around modern-day Hohhot) during the 13th century.

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