The King's Jubilee was featured in the 1937 UKBG's (United Kingdom's Bartender's Guild) Approved Cocktails book (links to a free copy of the book). The book features a number of Jubilee cocktails which were created to commemorate King George V's Silver Jubilee (25th anniversary of accession).Originally created by Harry Craddock with a 2:1:1 ratio (see original here).