 Complete the following phrase:  Pacelli became the under-secretary in 1911, adjunct-secretary in 1912 a position he received under Pope Pius X and retained under Pope Benedict XV, and secretary of the Department of Extraordinary Ecclesiastical Affairs in February 1914. On 24 June 1914, just four days before Archduke Franz Ferdid of Austria was assassinated in Sarajevo, Pacelli, together with Cardinal Merry del Val, represented the Vatican when the Serbian Concordat was signed. Serbias success in the 