Hadrian ruled the Roman Empire for 21 years. His legacy, however, is a tangled mess. On the one hand, he left behind impressive architectural marvels, like Hadrian’s Wall; and his epic journeys across land and sea reinforced the notion that he was not just the leader of Rome, but the representative of tens of millions of people across a vast commonwealth. And yet, both his early years and, as we’ll talk about today, his latter years, were strange and shrouded with intrigue and animosity. One senator even cursed Hadrian. But as we’ll see today, amid the mess, Hadrian managed to set up a succession plan that ensured two generations of stability—and place a teenager into the line of succession who would grow up to become Rome’s famed philosopher king: Marcus Aurelius.