In editorial cartoons and patriotic posters, Brother Jonathan was usually depicted as a typical American revolutionary, with tri-cornered hat and long military jacket. Originally, from 1776 to 1783, "Brother Jonathan" was a mildly derisive term used by the Loyalists to describe the Patriots.
A popular folk tale about the origin of the term holds that the character derives from Jonathan Trumbull (1710-85), Governor of Connecticut. It is said that George Washington often uttered the words: "We must consult Brother Jonathan" when faced with a difficult question; however, that origin is doubtful, as neither man made reference to the story during their lifetimes and the first appearance of the story has been traced to the mid 1800s, long after their deaths.
The character was adopted by Americans from 1783 to 1815. During the War of 1812, the term "Uncle Sam" appeared. Uncle Sam appeared in newspapers from 1813 to 1815, and in 1816 it appeared in a book. Brother Jonathan was replaced by the female personification Columbia and the increasingly popular Uncle Sam. Indeed, the character can be seen as an intermediate step between Yankee Doodle and Uncle Sam as a representation of the everyday American.
However, Brother Jonathan, and variants of the name Jonathan continued to be used as slang references to Americans through the American Civil War. For example Johnny Reb meant a Confederate soldier, and a popular song was "When Johnny Comes Marching Home".