After a two-month trial period, Pius X named Merry del Val pro-Secretary of State. Church historian
Roger Aubert has stated that Merry del Valls' conservative views, as well as his opposition to
ecumenism and to establishing dialogue between the different Christian churches, might have reinforced the ideological positions of Pope Pius X. Among Merry del Val's diplomatic achievements was the signing of a concordat with
Serbia barely four days before the
assassination of Archduke Franz Ferdinand, the Austrian heir-apparent, in
Sarajevo on 28 June 1914 plunged Europe into the
First World War. Merry del Val recorded that the "breakthrough" in the difficult negotiations with Belgrade came on the
Feast of the Sacred Heart. The Pope and his Cardinal Secretary of State were fully aware that war was imminent. Pius X had already warned a departing
Brazilian Ambassador a year earlier that Europe would not "get through 1914" without a major conflagration. ), Merry del Val and
Nicola Canali at the 1914 signing of the
Serbian concordat under a portrait of
Pope Pius X. Merry del Val remained Secretary of State throughout the pontificate of Pius X, but when
Pope Benedict XV, an old associate of Rampolla, was elected in the
conclave of 1914, Merry del Val was not reappointed. Benedict XV in fact appointed as his Cardinal Secretary of State, first
Domenico Ferrata, who died almost immediately, and then
Pietro Gasparri. Thus at the head of the Church were the two bishops, della Chiesa (now Pope Benedict XV) and Gasparri, who had been leapfrogged by Merry del Val on the eve of the conclave in 1903. But Benedict XV appointed Merry del Val as
secretary of the Supreme Sacred Congregation of the Holy Office on 14 October 1914. For a man who had been an exceptionally young Secretary of State, the Congregation was considered a lesser though important assignment. The Pope did not appoint Merry del Val as Prefect, because at the time the Popes themselves were Prefects of the
Holy Office. The post of Secretary was then the highest-ranking office in the
Dicastery. Merry del Val as secretary was responsible for running the daily affairs of the Holy Office, in which capacity he reportedly explained the Papal policy of
non possumus to
Theodor Herzl and the emerging movement of
Zionism, saying that as long as Jews denied Christ's divinity, the Church could not make a declaration in their favor. When the British Catholic diplomat
Mark Sykes visited Merry del Val to speak about the same topic, the Cardinal was somewhat more supportive. He told Sykes that the Holy See would look benignly on the project. Historian
Jean Meyer has remarked Merry del Valls' reactionary and
anti-Judaic views. Merry del Val was convinced of the irreconcilable hostility between Christians and Jews, and he also believed that
Jews committed ritual murders against Christians. As Secretary of the Congregation of the Holy Office, on 2 April 1928 he ordered the abolition of the
Opus sacerdotale Amici Israel. After the death of Benedict XV (22 January 1922), Merry del Val was retained by Pius XI in the role of Secretary of the Holy Office, which he held until 26 February 1930, when he died unexpectedly in
Vatican City, aged 64, during an operation for appendicitis. == Beatification process ==