Rome in the 1st Century - Episode 4: Years of Eruption (Ancient History Documentary).

This time they chose not to fight, but rather to work together and choose a new emperor. They chose Trajan, a Spanish-born Senator and general.

It was a bold move, but very successful. With trusted advisers, such as Pliny the Younger, Trajan expanded the Roman Empire to its greatest size and launched public works, tax relief and a child welfare program. His reign turned the Roman Empire into a multicultural global society that's still relevant today, 2,000 years later.