After the war, a character called Uncle Sam began appearing in political cartoons, his form evolving from an earlier cartoon character called Brother Jonathan that was popular during the American Revolution. Uncle Sam soon replaced Brother Jonathan as American's most popular symbol. The most enduring portrait of Uncle Sam was created by artist James Montgomery Flagg in his famous army recruiting posters of World Wars I and II. That version - a tall man with white hair and a small white beard on his chin, a dark blue coat and a tall hat with stars on it - was a self-portrait of Flagg.