For most of the history of the common law, Anglo-American courts did not encourage guilty pleas but actively discouraged them. Plea bargaining emerged as a significant practice only after the American Civil War, and it generally met with strong disapproval on the part of appellate courts. This practice nevertheless became a dominant method of resolving criminal cases at the end of the nineteenth century and beginning of the twentieth, and it attracted significant attention and criticism as a result of crime commission studies in the 1920s. In recent years, American criminal courts have become even more dependent on the guilty plea, but the good press that plea bargaining currently enjoys in legal and social science circles is a very recent development. This article explores changes in guilty plea practices and in attitudes toward the guilty plea from the Middle Ages to the present.