Emperor Constantine and the Council of Nicaea.  The burning of Arian books is illustrated below.  Drawing on vellum.  From MS CLXV, Biblioteca Capitolare, Vercelli, a compendium of canon law produced in northern Italy ca. 825.
file: <a href="//commons.wikimedia.org/wiki/User:Jdsteakley" title="User:Jdsteakley">James Steakley</a>; artwork: unknown
Jean Hubert et al., <i>Europe in the Dark Ages</i> (London: Thames &amp; Hudson, 1969), p.  143