The sandwich is attributed to the Earl of Sandwich, who was said to be an avid card player and wanted something to eat that wouldn't require 2 hands. The story goes that his cook gave him a piece of meat between two slices of bread, and the sandwich was born. read more
Basically, a traditional club sandwich includes turkey on the bottom layer, and bacon, lettuce, and tomato on the top, sometimes specifically named a turkey club. Other common club sandwiches generally vary the bottom layer, for example a “ chicken club” or a “ roast beef club”. read more
There doesn't seem to be an official consensus on where the club sandwich originated, but in historical literature many Member Club's are referenced. read more