Hennessy is one of the oldest houses to hail from Cognac, dating back as far as 1765 when set up by the Irishman Richard Hennessy. To this day they hold some of the oldest and rarest reserves of eaux de vie (the spirits that are blended together to create Cognac). There are barrells in their collection still holding liquid from 1811. Quality is also at the heart of everything that Hennessy does with legal restrictions often surpassed for even tighter and more stringent internal regulations.
The first thing to say is that some of this Cognac is 200 years old. Once you've somehow understood quite what that means there is a whole host of flavours and aromas to battle with- your senses are assaulted from all angles. Once tasted, never forgotten.