Jacques Marie Charles Trolley de Prévaux (2 April 1888 — 19 August 1944) was a French Navy officer and member of the Resistance.

After a brilliant career in the Navy as a pioneer of the Aéronavale and having risen to the rank of captain, he fell out of favour with the Vichy Regime for his sympathies with the Resistance.

He became a leader of an intelligence network focused on the Mediterranean, and was eventually betrayed and assassinated by the Nazis, along with his wife, Lotka Leitner.

[1] There, he acquired a taste for opium, which was a common pastime in the Navy at the time, Toulon harbouring several establishments specialised in that trade.

In August 1914, he served as gunnery and maneuver officer on the torpedo boat Chasseur; in May 1916, he transferred on Paris as aid to the chief of the naval fusiliers.

[1] On 1 June 1924, he was given command of Cuers-Pierrefeu airbase in Var,[1][5] which put him in charge of large zeppelin Méditerranée (ex-Nordstern, transferred from Germany to France as war reparation, and sister-ship to the ill-fated Dixmude).

[1] In 1939, Duguay-Trouin deployed to protect shipping between the metropolitan France and the French West Africa, before transferring to the naval division of Levant.

[1] After the outbreak of the Second World War, at the time of the Armistice of 22 June 1940, Duguay-Trouin was in Alexandria[5][6] with the rest of the Force X, under Admiral Godfroy.

[19][6][20] In contrast to a few officers, such as d'Estienne d'Orves, whom this incident drove to join Free France,[6] Prévaux remained loyal to the Government and then to then Vichy Regime.

[6][21][5] From early 1942, Prévaux served as an informer to F2 under the nom de guerre of "Vox",[5] along with his wife Lotka Leitner as "Kalo", providing intelligence about the German Navy.

[6] In November 1942, when the Nazis invaded the so-called Zone Libre, F2 disbanded to avoid arrests; Prévaux was subsequently instrumental in reconstituting the network.

In the course of the following year, this network provided intelligence about German naval and air units, as well as about coastal fortifications,[5] which proved of interest for Operation Dragoon.