The MOUNT GAY Est. 1703 Barbados Rum XO RESERVE CASK RUM brand, founded in 1703 (Barbados), from 139 sister brands and 3027 competing brands. MOUNT GAY Est. 1703 Barbados Rum XO RESERVE CASK RUM's notoriety arose from exemplary management which optimizes product quality and client satisfaction, which in turn generate financial performance, and therefore, stock performance. Being a Popular brand online is assessed based on the evolution of worldwide Web searches over the last five years.