The name “Old Grog” dates back from the early days when the finest of Grenada’s Rum was shipped to his Majesty George III England. In order to identify the King’s Rum, the casks were marked G.R.O.G. which is the abbreviation for Georgius Rex Old Grenada. Or so the story on the bottle goes. Whether this is true or not is another matter. It does sound feasible though. The term “grog” is usually used to describe a mix of rum, water and limes which was given to sailor’s to prevent them getting too intoxicated drinking solely rum.