Citadelle Gin has a history which stretches back to 1775 when King Louis XVI authorized two Frenchmen, Carpeau and Stival, to open a genievre distillery at the Citadelle in Dunkirk, which would serve as the Royal Distillery with an exclusive 20 year privilege. The Citadelle Distillery produced about 1000 litres of genievre per day which was predominantly shipped in small casks for sale in England, where gin was very popular.
About 200 years later in 1989, Alexandre Gabriel of Cognac Ferrand, recognized that in France, gin had become more of an industrial spirit with much of the heritage and refinement lessened by time. He decided to create a handcrafted gin using small copper pots in the style and tradition of the Citadelle Distillery of old. Fortunately records existed of the old gin making techniques at the Citadelle Distillery, and after several years of research Alexandre Gabriel was successful in distilling an old style handcrafted gin under the Citadelle name. The Gin is produced at the Cognac Ferrand facilities in Cognac, France, and according to the Citadelle Gin website, it is produced under naked flame in small copper pot stills using a complex array of 19 botanicals.
Here is a link to the review of the best gin I have ever tasted, and the #16 spirit on my Rum Howler Top 100 Spirits Countdown.
#16 – Citadelle Reserve Gin (2011 Edition)
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You may follow my Countdown list of the 100 Best Spirits here: The Rum Howler 2015 – Top 100 Spirits
While most gins are not matured in oak casks, Citadelle Reserve (2013 Edition) Gin is not only aged in small oak casks, it is the first gin to be aged using a solera style maturation. According to the information provided on the 
The Rum Howler Blog 