Cardinal Merry del Val and Milenko Vesnić signing the Concordat between the Holy See and Serbia on June 24, 1914 (only a few days before the outbreak of the July Crisis). Left to right: <a href="//commons.wikimedia.org/wiki/Pius_XII" class="mw-redirect" title="Pius XII">Eugenio Pacelli</a> (at this time Secretary of the Congregation of Extraordinary Ecclesiastical Affairs and true designer of the agreement), <a href="https://en.wikipedia.org/wiki/Rafael_Merry_del_Val" class="extiw" title="en:Rafael Merry del Val">Rafael Merry del Val</a> (Vatican Secretary of State), <a href="https://en.wikipedia.org/wiki/Nicola_Canali" class="extiw" title="en:Nicola Canali">Nicola Canali</a> (his private secretary), Mons. Dionigi Cardon (1865-1928, Provost of Taggia, Liguria, Vatican's negotiator in Belgrade), <a href="https://en.wikipedia.org/wiki/Milenko_Radomar_Vesni%C4%87" class="extiw" title="en:Milenko Radomar Vesnić">Milenko Radomar Vesnić</a> (Special Minister of Serbia). Missing on the right (cut off): Lujo Bakotić (Serbian diplomatic agent). The wall portrait shows Pope <a href="//commons.wikimedia.org/wiki/Pius_X" title="Pius X">Pius X</a> who died a few month later.
<bdi><a href="https://www.wikidata.org/wiki/Q3770529" class="extiw" title="d:Q3770529"><span title="Italian photographer">Giuseppe Felici</span></a>
</bdi>
Vatican photo