In Cognac, and only in Cognac. In Hennessy, cognac can not be improvised, created with care and attention to detail. In the first place, there is the grapevine, the Ugni Blanc, the light grape perfect for the double distillation of the great copper stills of the Maison Hennessy. To ensure that the aromas are excellent and varied, only the eaux-de-vie from four major crus of the region (Grande Champagne, Petite Champagne, Borderies and Fins Bois) are selected for the privilege of becoming great Hennessy cognacs. Maturity is a test of vision and imagination, since this phase can extend beyond a lifetime. In Hennessy cellars, oak barrels of over 100 years, coming exclusively from French forests, reside in a dim light infused with heavy notes. A total of over 300,000 barrels rest in this place. Hennessy is proud to have one of the largest reserves of eaux-de-vie in the world. The Cantina del Fondatore is in itself a symbol of this heritage, the heart that defines the time of the Maison Hennessy. Each of these eaux-de-vie has been aged for at least fifty years and many exceed one hundred years of age. Once they reach their potential, they are placed in large glass demijoys embedded in wicker so as to preserve their exceptional qualities. They will then be used to create the rarest cognacs. The oldest eau-de-vie dates back to the 1800s.