Latest / Marcus Aurelius: Rome's Philosopher King — Fexingo History / Marcus Aurelius and the Stoic's Garden: The Inner Citadel
Transcript
- Lucas: So last time we talked about the Temple of Peace library, and that got me thinking about one of Marcus's most famous metaphors — the inner citadel. He uses it a lot in the Meditations. Luna: The inner citadel — is that the idea of retreating into your own mind? Lucas: Exactly. He writes, 'Men seek retreats for themselves — houses in the country, seashores, mountains — but you can at any moment retreat into yourself.' For Marcus, the mind is a fortress that no external event can breach, if you train it right. Luna: That sounds very Stoic, but also a bit isolating, doesn't it? Lucas: It can seem that way. But Marcus isn't advocating disengagement. He's saying that before you act, you need to be in control of your own judgments. The inner citadel is where you process impressions before you respond. And it's a deeply practical image for a man leading armies on the Danube. Lucas: If you've been stepping into history with us episode by episode — about Mediterranean empires, their wars, their plagues — you might have noticed how often the personal and the political collide. We keep this show ad-free because we love diving into these stories without interruption. If you'd like to help keep it that way, you can support us at buy me a coffee dot com slash fexingo. Every little bit helps us keep the conversation going. Luna: Yeah, it's a small way to give back for all the hours of research Lucas puts in. I've seen his bookshelf — it's a fortress too. Lucas: It's a friendly fortress. Anyway, back to Marcus's citadel — the idea actually comes from Epictetus, his philosophical grandfather. Epictetus taught that we have a faculty called prohairesis — moral choice — that is utterly inviolable. No one can force you to assent to a false impression. Luna: Prohairesis — that's the 'ruling center' of the mind, right? Lucas: Close. Epictetus uses prohairesis for the will itself. Marcus is more influenced by what the Stoics called the hêgemonikon — the 'leading part' of the soul, which includes judgment, impulse, and assent. The inner citadel is a spatial metaphor for that. Lucas: Now, what's fascinating is that Marcus writes these meditations not as abstract philosophy but as notes to himself. He's literally shoring up his own citadel. For example, during the Marcomannic Wars, he tells himself: 'You can strip away many unnecessary troubles, for they lie entirely in your own opinion.' That's the inner citadel at work. Luna: But surely the plague and the constant fighting must have tested that fortress. Lucas: Absolutely. The Antonine Plague was ravaging the empire, and Marcus lost co-emperor Lucius Verus, probably to the plague, in 169. His own health was failing. Yet he keeps returning to the citadel. In one passage, he writes: 'A podium and a prison are each a place — one high, one low — but the inner citadel can be the same in both.' Luna: So he's saying you can be equally free in a palace or in chains, as long as your mind is your own. Lucas: Exactly. But there's a tension here. Some critics — especially modern ones — say this inner citadel can become a kind of retreat from responsibility. If everything is just a matter of your own judgment, do you still have a duty to change the world? Lucas: Marcus himself struggled with that. He was an emperor — he had to send men to die. And he writes about the 'communal nature' of the rational mind. The inner citadel isn't meant to be a bunker; it's where you prepare to act justly toward others. Luna: So it's more like a command center than a panic room. Lucas: Yes, that's a great way to put it. Marcus actually uses another image — the soul should be like a 'bright light' that illuminates whatever it touches. The citadel is where that light is kindled. Lucas: There's also a striking parallel with Heraclitus, whom Marcus quotes. Heraclitus said, 'The soul has its own logos, which increases itself.' Marcus adapts that: your inner citadel is the seat of that logos — reason — which connects you to the universal reason governing the cosmos. So retreating inward is also connecting outward. Luna: That's a really beautiful synthesis. But is the inner citadel a uniquely Stoic idea? I mean, other philosophies have versions of it. Lucas: Definitely not unique. Seneca wrote about the 'impregnable wall' of philosophy. And later, Descartes had his cogito — 'I think, therefore I am' — which is also a kind of inner certainty. But the Stoic version is more active. It's not just about doubting everything; it's about controlling your responses. Lucas: One of my favourite passages from Marcus is this: 'The mind of the universe is social. For it has made the lower things for the sake of the higher, and it has fitted the higher to one another.' He's saying the inner citadel isn't an escape from society — it's the place where you realise your duty to others. Luna: So the citadel has windows, not just walls. Lucas: Exactly. And that's what makes Marcus's Stoicism so enduring. He's not a cold logician; he's a man trying to be good in a world full of suffering. The inner citadel is his way of holding onto his values when everything around him is falling apart. Lucas: There's a famous scene where he writes, 'The cucumber is bitter — throw it away. There are brambles in the path — go around them.' That's the inner citadel in action: don't waste emotional energy on things you can't change. Luna: But what about when the brambles are people? Like Avidius Cassius, who rebelled against him. Lucas: Great question. Marcus's response to the rebellion is telling. He didn't seek vengeance. He wrote to the Senate asking them to spare Cassius's family. That's the inner citadel allowing him to act with clemency even when betrayed. He says elsewhere: 'The best revenge is not to become like your enemy.' Luna: That's remarkably generous, especially for a Roman emperor. Lucas: It is. But it also shows the limits of the inner citadel. Some historians argue that Marcus's clemency toward Cassius's co-conspirators may have contributed to Commodus's later problems — he didn't purge the court thoroughly. The citadel can become a blind spot. Lucas: Still, as a personal practice, it's powerful. Marcus uses visualisation techniques: he imagines the universe as a vast, orderly whole, and himself as a tiny part of it. That helps him accept events like death and disease. He writes: 'You have embarked, you have made the voyage, you have come to shore — get out.' Luna: That's from the image of life as a ship voyage. Very evocative. Lucas: And here's where the inner citadel meets Stoic physics. The Stoics believed in ekpyrôsis — the periodic conflagration of the cosmos. Everything returns to fire, then is reborn. Marcus uses that to relativise his own troubles: this too will pass, and in the grand cycle, it's nothing new. Luna: So the inner citadel isn't just a psychological tool — it's grounded in a whole worldview. Lucas: Exactly. And I think that's what gives it such strength. It's not a mere trick; it's a conviction that the universe is rational and good, and that your mind is a fragment of that universal reason — the logos. When you retreat into your citadel, you're aligning yourself with the logos. Lucas: But we should also be honest about the cracks. Marcus himself admits moments of despair. In one passage, he calls life 'a bitter river' and 'a phantom.' The inner citadel isn't a magic shield — it's a practice, a daily effort. Luna: I think that honesty is what makes him so relatable. He's not a flawless sage; he's a struggling human. Lucas: Absolutely. And that's why the Meditations have survived. They're not polished essays; they're scratchings in the dark — a man talking to himself, trying to find his footing. The inner citadel is his lighthouse. Luna: I've always found that image comforting. Maybe that's why people still read him today. Lucas: Maybe so. And it makes you wonder — if you had to build your own inner citadel, what would it look like? What would you put inside? That's a question Marcus would approve of.