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.
The Pax Romana was a period of relative peace and cultural achievement in the Roman Empire, especially in the area of building (e.g., Hadrian's Wall, Nero's Domus Aurea, and the Flavians' Colosseum and Temple of Peace), and Silver Age Latin literature.thers date it as late in the reign of Augustus as the year A.D. 14. Edward Gibbon, author of The History of the Decline and Fall of the Roman Empire is sometimes credited with the idea of the Pax Romana.