The prosperity of the Roman Empire reached its greatest height
in the A.D. 100's.
The 'five good emperors' - Nerva, Trajan, Hadrian,
Antonius Pius, and Marcus Aurelius - reigned in turn
from A.D. 96 to 180. Their learning and devotion to duty made
them loved as well as respected.
They are also called the
Adopted Emperors because the dynastic principle was
changed to adoptive emperorship (choice of the most fit to rule).