<div class="fn value">
Unknown author<span style="display: none;">Unknown author</span></div>
13<sup>th</sup> century <div style="display: none;">date QS:P571,+1250-00-00T00:00:00Z/7</div>
book: G. Pischel, <i>Storia Universale dell'Arte</i>, Vol. 2, Mondadori, Verona 1966