Treaty of Christburg
...that before he became Pope Urban IV, Jacques Pantaléon mediated the Treaty of Christburg between the pagan Prussians and the Teutonic Knights?
...that before he became <a href="./Pope_Urban_IV" id="mwDEY" rel="mw:WikiLink" title="Pope Urban IV">Pope Urban IV</a>, Jacques Pantaléon mediated the <b id="mwDEc"><a href="./Treaty_of_Christburg" id="mwDEg" rel="mw:WikiLink" title="Treaty of Christburg">Treaty of Christburg</a></b> between the pagan <a href="./Old_Prussians" id="mwDEk" rel="mw:WikiLink" title="Old Prussians">Prussians</a> and the <a class="mw-redirect" href="./Teutonic_Knights" id="mwDEo" rel="mw:WikiLink" title="Teutonic Knights">Teutonic Knights</a>?