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In page Pannonian Avars:

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The language or languages spoken by the Avars are unknown.[1][2][3][4] Classical philologist Samu Szádeczky-Kardoss said that most of the Avar words used in contemporaneous Latin or Greek texts appear to have their origins in possibly Mongolian or Turkic languages.[5][6] Other theories propose a Tungusic origin.[7] According to Szádeczky-Kardoss, many of the titles and ranks used by the Pannonian Avars were also used by Turks, Proto-Bulgars, Uighurs and/or Mongols, including khagan (or kagan), khan, kapkhan, tudun, tarkhan, and khatun.[6] There is evidence, however, that ruling and subject clans spoke a variety of languages. Proposals by scholars include Caucasian,[2] Iranian,[8] Tungusic,[9][10][11] Hungarian[citation needed] and Turkic.[12][13]