He was born in Reggio di Calabria on 31 August 1893 to a banker's family. In 1914 he enlisted in the army for his national service. Named Lieutenant of Fortress Artillery in June 1915, Jacomoni participated in the campaigns of the Italian Front of World War I. At the same time, he pursued his studies in Law at the University of Rome, and graduated in July 1916.
In May 1919 he was appointed as a member of the Italian delegation to the Paris Peace Conference, and worked as a liaison with the Austrian, Hungarian and later Bulgarian delegations. In October 1919 he was appointed as secretary in the Italian embassy at Bucharest, a post he held until recalled to the Ministry of Foreign Affairs in August 1920. In the next few years he served in various diplomatic missions and delegations as a secretary, including a brief mission to Albania in April 1926, where he laid much groundwork for the Italo-Albanian Friendship and Mutual Assistance Treaty of November 1926.
On his return, he became a close associate of Dino Grandi, then Undersecretary of Foreign Affairs and soon to become Minister. Initially head of the Ministry's Historical Service but late rising to be deputy head of Grandi's ministerial office, he participated in a number of missions to the Italian delegations to international conferences regarding the Dawes and Young plans, or the Second London Naval Conference.
In October 1932, Jacomoni married Maja Cavallero, the daughter of General (and later Marshal) Ugo Cavallero. During the next few years, he was engaged mainly in Geneva at the League of Nations. He was appointed as minister to the Kingdom of Albania from 9 September 1936 until shortly after the Italian invasion of Albania in April 1939. On 17 April he was promoted to ambassadorial rank and on 22 April he became the country's Viceroy (Luogotenente del Re, "Lieutenant-General of the King"). Jacomoni retained this post, which made him the country's effective governor, during much of the Italian occupation.
After the war, he was tried along with other senior officials of the Fascist regime, and sentenced by the Italian High Court to 24 years imprisonment on 12 March 1945. He was however released with the general amnesty issued by the Italian government in June 1946, and his sentence was finally commuted altogether in March 1948.
- F. Grassi Orsini. "JACOMONI, Francesco". Treccani.it (in Italian). Retrieved 29 April 2011.
- Pearson, Owen (2004), Albania and King Zog: Independence, republic and monarchy 1908–1939, I.B. Tauris, pp. 473, 475, ISBN 978-1-84511-013-0
- Pearson, Owen (2006), Albania in Occupation and War: From Fascism to Communism 1940–1945, I.B. Tauris, p. 241, ISBN 978-1-84511-104-5
- Pearson, Owen (2006), Albania in Occupation and War: From Fascism to Communism 1940–1945, I.B. Tauris, pp. 423, 430, ISBN 978-1-84511-104-5
- Pearson, Owen (2006), Albania as dictatorship and democracy: From isolation to the Kosovo War, 1946–1998, I.B. Tauris, pp. 47, 272, ISBN 978-1-84511-105-2
|Italian Ambassador to Albania
Albania occupied by Italy
|Lieutenant-General of the King in Albania