He joins the Evelpidon School along with I. Metaxas and Xen. General. In 1890 he graduates. In 1892 he attends the Cavalry School. The following year he leaves for military training in France and Belgium, returning in 1895. He served in the unfortunate Greek-Turkish war of 1897. He participated in the 1909 Gudi movement. From 1910 he served for two years as a military attaché at our Embassy in Sofia. With the outbreak of the war he was in the Directorate of the Bulgarian Staff as a representative of the Greek Army. He was then placed as a staff officer under the chief general successor Constantine I.

In 1917 he became a military attaché of the Greek Embassy in London. He actively participated in the promotion of the idea and rights of Greece on the issue of the Greekness of the East. He was active in the promotion of the cause of Greece and the Greek cause of Greece in the region of Eastern Thrace. He serves as adjutant in the military house of the President of the Republic, Admiral P. Kountouriotis ( 1926). He retired with the rank of General. He was engaged in writing short stories and poetry, the collection of short stories Agonaria was awarded in 1932.

From 1885 to 1890 Franzis attended the Euplidon School. Among his fellow students at the School were Ioannis Metaxas and Xenophon General. From 1893 to 1895 Franzis was in France and Belgium for military studies. In 1895 he returned to Greece and in 1897 he served his country as an artillery officer in the Greek-Turkish war of 1897.

In 1909 he took part in the Revolution in Goudi. From 1910 to 1912 he served as a military attaché at the Greek Embassy in Constantinople and in Sofia. With the outbreak of the First Balkan War he was assigned to the Directorate of Information and then was placed as a representative of the Greek army at the Bulgarian headquarters. Then and until the end of the Balkan Wars he was placed on the staff of King Constantine I.

In 1917 he was appointed military attaché at the Greek Embassy in London. In the negotiations at the Peace Conference in Paris after the end of the War, Frantzis attended in his capacity as Military Attaché at the Embassy in London. He concentrated, according to the instructions of his superiors, on enlightening the English agents of the Council on the question of the Greekness of Eastern Thrace.

In 1926 he was appointed head of the military household of the President of the Republic, Admiral P. Kountouriotis . After his retirement with the rank of General, he was engaged in writing poems and short stories. In 1932 he published the short story collection Agonaria. On his own initiative and that of other friends of the descendants of the families of 1821, the Patriotic Society of the Descendants of the Fighters of 1821 and Historical Generations of Greece was founded in 1938. General Ambrosios Frantzis passed away on March 1, 1953 in Athens.