Henri Arnault de Zwolle
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Henri Arnault de Zwolle (ca.1400 - 1466) was employed as a physician and astrologer to Philip the Good.
He was a student of the instrument-maker Jean de Fusoris, who was employed between 1400 and 1445 by Philip the Good and later by the French king Louis IX of France.
In 1440 he provided in a Latin manuscript the earliest illustration of a harpsichord. He gave a detailed description of the action and the operation of this keyboard plucked instrument with the complex linkages between the keyboard and the strings. He also described the lute and the clavichord. All instruments were to be played at the court and not in churches.
He later worked for the French kings Charles VII and Louis XI.
