The contribution in the collective monograph is devoted to the iconography of the alleged dream of the Saxon Elector Friderick III. the Wise. He saw in him a monk - Martin Luther, as he writes with a pen from the "Czech goose" (allusion to Master Jan Hus) on the door of the castle church in Wittenberg his reformist thesis.
The goose feather was said to be so long that it reached as far as Rome, where it knocked down the papal tiara of Leo X.