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, or Roman Peace, is a Latin term referring to the Empire in its glorified prime. From the end of the Republican civil wars, beginning with the accession of Augustus in 27 BC, this era in Roman history lasted until 180 AD and the death of Marcus Aurelius. Though the use of the word 'Peace' may be a bit misleading, this period refers mainly to the great Romanization of the western world.