Jean Miélot
... that before Jean Miélot created an illuminated manuscript for Duke Philip the Good of Burgundy, he produced a "dummy" version, complete with pictures, decorations and text?
... that before <b id="mwC4k"><a href="./Jean_Miélot" id="mwC4o" rel="mw:WikiLink" title="Jean Miélot">Jean Miélot</a></b> <i id="mwC4s">(pictured)</i> created an <a href="./Illuminated_manuscript" id="mwC4w" rel="mw:WikiLink" title="Illuminated manuscript">illuminated manuscript</a> for Duke <a href="./Philip_the_Good" id="mwC40" rel="mw:WikiLink" title="Philip the Good">Philip the Good</a> of <a href="./Duchy_of_Burgundy" id="mwC44" rel="mw:WikiLink" title="Duchy of Burgundy">Burgundy</a>, he produced a "dummy" version, complete with pictures, decorations and text?