Four ice cubes, 4 oz of spiced rum, 1 oz simple syrup, juice from 1/4 of a lime.
Known today as a Daiquiri.
The Daiquiri is very similar to the Royal Navy days gone by daily ration called grog - rum, water, sugar, and lemon or lime juice introduced August 21, 1740 by Vice Admiral Edward Vernon. Vernon wore a coat made of grogram cloth and was nicknamed 'Old Grogram' or just 'Old Grog' (by the cool sailors).
Drinking water had to be brought on ships of the day in casks. Algae formed in the casks and the water became slimy. This not very appealing, stagnant water was first mixed with beer or wine to make it more drinkable, but the beer and wine also had to be stored in casks which magnified storage issues.
Each sailor's daily ration of this water/beer mix was a gallon per sailor - requiring lots of casks.
A 1/2 pint of rum gradually replaced the water/beer or wine mix. The rum was mixed with 1 quart of water (4 parts water to 1 part rum) and was issued in 2 servings - one before noon and the other at the end of the working day. The ration was made regulation in the Royal Navy in 1756 even though some sailors would stockpile their rations for several days to drink all at once (binge drinkers of the mid-1700s! Who knew!).
It was noticed that Admiral Vernon's sailors were obviously healthier than all other sailors in the Royal Navy, and though they didn't understand it at the time, the reason was the vitamin C from the lemon or lime juice used to offset the foul taste of the water from the casks. The vitamin C in the juice helped ward off disease - mainly scurvy.
British sailors got the nickname "limeys" for all the limes used to flavor their Grog.