The Regimen Sanitatis Salernitanum (the lilium medicinae) is one of the oldest comprehensive health guides ever penned by mankind. Dating to the medieval era, it speaks on phlebotomy (bloodletting), diet, exercise, and disease prevention. All of its content is presented against the backdrop of the four humors. As a text of its era it mentions what amounts to the miasmatic theory and accidentally proposes a very correct method of sewer sanitation.