Ion Antonescu
Diplomatic assignments and General Staff positions

Lieutenant Colonel Ion Antonescu retained his visibility in the public eye during the interwar period. He participated in the political campaign to earn recognition at the Paris Peace Conference of 1919 for Romania's gains in Transylvania. His nationalist argument about a future state was published as the essay Românii. Origina, trecutul, sacrificiile și drepturile lor ("The Romanians. Their Origin, Their Past, Their Sacrifices and Their Rights"). The booklet advocated extension of Romanian rule beyond the confines of Greater Romania, and recommended, at the risk of war with the emerging Kingdom of Yugoslavia, the annexation of all Banat areas and the Timok Valley. Antonescu was known for his frequent and erratic changes of mood, going from being extremely angry to being calm to angry again to being calm again within minutes, behaviour that often disoriented those who had to work with him. The Israeli historian Jean Ancel wrote that Antonescu's frequent changes of mood were due to the syphilis he contracted as a young man, a condition he suffered from for the rest of his life.

He became attache in Paris in 1922. He negotiated a credit worth 100 million French francs to purchase French weaponry. He worked together with Romanian diplomat Nicolae Titulescu; the two became personal friends. He was also in contact with the Romanian-born conservative aristocrat and writer Marthe Bibesco, who introduced Antonescu to the ideas of Gustave Le Bon, a researcher of crowd psychology who had an influence on Fascism. Bibesco saw Antonescu as a new version of 19th century nationalist Frenchman Georges Boulanger, introducing him as such to Le Bon. In 1923, he made the acquaintance of lawyer Mihai Antonescu, who was to become his close friend, legal representative and political associate.

After returning to Romania in 1926, Antonescu resumed his teaching in Sibiu, and, in the autumn of 1928, became Secretary-General of the Defense Ministry in the Vintilă Brătianu cabinet. He married Maria Niculescu, for long a resident of France, who had been married twice before: first to a Romanian Police officer, with whom she had a son, Gheorghe (died 1944), and then to a Frenchman of Jewish origin. After a period as Deputy Chief of the General Staff, he was appointed its Chief (1933–1934). These assignments coincided with the rule of Carol's underage son Michael I and his regents, and with Carol's seizure of power in 1930. During this period Antonescu first grew interested in the Iron Guard, an antisemitic and fascist-related movement headed by Corneliu Zelea Codreanu. In his capacity as Deputy Chief of Staff, he ordered the Army's intelligence unit to compile a report on the faction, and made a series of critical notes on Codreanu's various statements.

As Chief of Staff, Antonescu reportedly had his first confrontation with the political class and the monarch. His projects for weapon modernization were questioned by Defense Minister Paul Angelescu, leading Antonescu to present his resignation. According to another account, he completed an official report on the embezzlement of Army funds which indirectly implicated Carol and his camarilla (see Škoda Affair). The king consequently ordered him out of office, provoking indignation among sections of the political mainstream. On Carol's orders, Antonescu was placed under surveillance by the Siguranța Statului intelligence service, and closely monitored by the Interior Ministry Undersecretary Armand Călinescu. The officer's political credentials were on the rise, as he was able to establish and maintain contacts with people on all sides of the political spectrum, while support for Carol plummeted. Among these were contacts with the two main democratic groups, the National Liberal and the National Peasants', parties known respectively as PNL and PNȚ. He was also engaged in discussions with the rising far right, antisemitic and fascist movements; although in competition with each other, both the National Christian Party (PNC) of Octavian Goga and the Iron Guard sought to attract Antonescu to their side. In 1936, to the authorities' alarm, Army General and Iron Guard member Gheorghe Cantacuzino-Grănicerul arranged a meeting between Ion Antonescu and the movement's leader, Corneliu Codreanu. Antonescu is reported to have found Codreanu arrogant, but to have welcomed his revolutionizing approach to politics.
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