The idea of psychiatry was first discovered by the Greeks and then by extension, the Romans. However, Roman psychologists were rarely found. The Greek psychologist Aelius Galen, who later became the most learned and accomplished psychologist in the Roman Empire, was the first person to develop the idea that mental health and physical health were connected. He then went on to share his theory with the Roman citizens, this is proven when Celsus, a roman resident, says, “A person should put aside some part of the day for the care of his body. He should always make sure that he gets enough exercise, especially before a meal.” This theory then went on to be the base of most modern-day psychology. Galen believed that a person’s state of mind would affect their physical state and that the mind and body were connected. Some mental diseases found in Rome included hysteria, a condition believed to only occur in women, or depression which could occur in all genders and was believed to be treatable by bathing in warm water.