It’s the birthday of Charles Schulz.

Schulz started publishing a cartoon strip called L’il Folks in the local paper, the St. Paul Pioneer Press, but they dropped it after a couple of years. Schulz sent some of his favorite L’il Folks cartoons to the United Features Syndicate, and in 1950, the first Peanuts strip appeared in seven national newspapers. The first strip introduced Charlie Brown, and Snoopy made an appearance two days later. The rest of the Peanuts characters were added slowly over the years: Linus, Lucy, Schroeder, Pig Pen, Peppermint Patty, and many more. Throughout the years, the object of Charlie Brown’s unrequited love is known simply as The Little Red-Haired Girl.

Peanuts was eventually syndicated in more than 2,500 newspapers worldwide, and there were more than 300 million Peanuts books sold, as well as 40 TV specials, four movies, and a Broadway play.