Trajan is succeeded by Hadrian, most known for Hadrian's Wall here, the upper bound of the Roman Empire. And then the Pax Romana ends with Marcus Aurelius, who is viewed as a, he's actually wrote Meditations. He's a philosopher emperor. He's viewed as one of the last great Stoic philosophers. And so with that, you have the end of this period of Pax Romana. And as we'll see in the next few videos, we then start really getting into the decline of at least the Western Roman Empire. As we'll see, the Eastern Roman Empire outlives the West by a good thousand years.