Solomiac was a son of a shopkeeper. In the course of his career in the French colonial service, he was appointed in July 1925 as a delegate in Beirut then in 1930 in Damascus, during the French Mandate for Syria and the Lebanon. After the deposition of Taj al-Din al-Hasani, Solomiac officiated on November 19, 1931 as head of state of the Syrian Republic, until June 11, 1932 when Mohammed Ali al-Abed was elected by the Syrian Parliament to the presidency.
Later on, Solomiac went to Africa in which he became the governor of French Sudan from 22 May to 30 November 1933 on an interim basis. On August 15, 1934, he became the successor of François Adrien Juvanon as a governor of French India, he held this position until October 1936. On April 21, 1939, he became the Governor-General of French Equatorial Africa, he remained in office until September 3, 1939. On November 7, 1940, Solomiac took over from Jean Alexandre Léon Rapenne the interim post of Governor of Niger. However, he was deposed by the Vichy regime as being not loyal to them, and was replaced on 8 December 1940, by General Maurice Falvy. In August 1944, Léon Solomiac was entrusted with the management of official duties of the prefecture of Tarn. He was the "Prefect of the Libération", replacing a prefect appointed by the Vichy regime in July 1944, and was in office until early 1946.
- Profile of Léon Solomiac
- Nadine Méouchy (2002). France, Syrie et Liban, 1918-1946. Les ambiguïtes et les dynamiques de la relation mandataire (in French). Damascus: Institut français d'études arabes de Damas. p. 148.
- "Syria". World Statesmen.org.
- "Mali". World Statesmen.org.
- "India". World Statesmen.org.
- "Congo-Brazzaville". World Statesmen.org.
- "Niger". World Statesmen.org.
- "Les préfets du Tarn des origines à nos jours". Website of the Département du Tarn (in French).
(Acting for Fousset)
| Governor of Mali
(Acting for Fousset)
22 May 1933–30 November 1933
Louis Jacques Eugène Fousset
François Adrien Juvanon
| Governor of French India
Horace Valentin Crocicchia
François Joseph Reste
| Governor General of French Equatorial Africa
21 April 1939–3 September 1939
Pierre François Boisson
Jean Alexandre Léon Rapenne
| Governor of Niger
7 November 1940–8 December 1940
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