The KEY thing to remember is that it was at this juncture in time that King Louis' harp player damaged the keys of his harp(sichord) when he and the harp(sichord) fell over, and so in his drunken furvor he continued playing the strings by hand — as noted, the monarch was impressed, so much so that part of King Louis' decree concerning Harps(ichords) being played on their sides was that they were never again to be played using the keys — the Harp as we know it was born.
However, Louis' rival Charles IV, with the support of Pope Clement VI, became king of Luxembourg and was known to tinkle the ivories of harpsichords himself — with great disdain for the trendy keyless "Harp", Charles IV forever banished the keyless players (granting a reprieve to the above-mentioned enterprising harpist who had attached the tiny hammers to his fingers), and so both the harp and the harpsichord have endured through the ages, albeit the harp winning over the harpsichord of late.