feb 15, 180 - This was the when Pax Romana had ended. Also when the Romans took a practical approach to science and engineering. They studied stars and plants. To improve health,Roman doctors studied the works of the Greek. One of the greats was Galen who studied the the body. He described the values of the heart and noted differences between arteries and veins.
Added to timeline:
Date:
feb 15, 180
Now
~ 1847 years ago