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In page Cimbri:

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The name of the Danish region Himmerland (Old Danish Himbersysel) has been proposed to be a derivative of their name.[4] According to such proposals, the word Cimbri with a c would be an older form before Grimm's law (PIE k > Germanic h). Alternatively, Latin c- represents an attempt to render the unfamiliar Proto-Germanic h = [x] (Latin h was [h] but was becoming silent in common speech at the time), perhaps due to Celtic-speaking interpreters (a Celtic intermediary could also explain why one proposed etymology for the Teutons, Germanic *Þeuðanōz, became Latin Teutones).[citation needed]