Dutch King <a href="https://en.wikipedia.org/wiki/William_I_of_the_Netherlands" id="mwtw" rel="mw:WikiLink" title="William I of the Netherlands">William I</a> and <a href="https://en.wikipedia.org/wiki/Pope_Leo_XII" id="mwuA" rel="mw:WikiLink" title="Pope Leo XII">Pope Leo XII</a> sign concord.