Artificial intelligent assistant

chivauchier

chivauchier Obs.
  [ad. OF. chevauchère nom. of chevaucheor, rider, f. chevaucher to ride: see chevachee.]
  A rider, a courier.

1420 Stokes, etc. tr. Hen. V in Ellis Orig. Lett. Ser. iii. No. 29 We sende ȝowr graciows lettres vn to the Erche⁓byschopys, of Mayns, Trese, and of Cologne by Hans Pruce ȝowr chivauchier.

Oxford English Dictionary

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