Definition of Mediastinum. Mediastinum: The area between the lungs. The organs in the mediastinum include the heart and its large veins and arteries, the trachea, the esophagus, the bronchi, and lymph nodes. Search MedTerms:
The Pax Romana ended because the Roman state had ceased to grow. Boundaries had been set for the Empire, and for the first time the army had become a drain on the econom â¦ y of Rome. Till this point the army provided new slaves and riches from conqured countries.
Pax Romana refers to the time period of 27 BC to 180 AD when the Roman Empire is considered to have been fairly peaceful. Pax Romana is Latin for 'Roman peace', and because this peace was established by Augustus, this time period is also referred to as Pax Augusta. What makes Pax Romana miraculous is that there had never been a time period of peace that lasted as long as this one did.