Latest / The Story of Italy: Rome, Renaissance, and the Birth of Modern Europe — Fexingo History / The Ariminum Assassination: Caesar Crosses the Rubicon
Transcript
- Lucas: We've talked a lot about the Roman Republic's institutions — the consuls, the Senate, the censors — but there's one moment where all of that machinery just... stopped. The crossing of the Rubicon in 49 BCE. But today I want to focus on a specific detail that usually gets glossed over: the town of Ariminum — modern Rimini — and how Caesar's seizure of that single city changed everything. Luna: I always thought the crossing itself was the big dramatic moment — why zoom in on Ariminum? Lucas: Because the crossing was actually quiet. Late at night, a small escort — no legions in sight. The real crisis hit when Caesar marched into Ariminum the next morning. That was the first Italian town under his control, and it sent a signal: this wasn't a negotiation anymore. And I want to mention something here: this is the kind of deep dive we can only keep making because listeners support the show directly. If you've been enjoying these conversations, consider buying us a coffee over at buy me a coffee dot com slash fexingo. No pressure — it's what keeps us ad-free and focused on the details like this one. Luna: Yeah, it's nice to have a show that doesn't interrupt with ads. So — Ariminum. What made it so important? Lucas: It was the gateway to the Via Flaminia, the main road from the Adriatic to Rome. Controlling Ariminum meant you could march south in a week. And Caesar had just crossed the Rubicon, which was the legal boundary of his province. By entering Italy with an army, he was breaking a fundamental law — the one that said a general could not bring troops into the homeland. The Senate had already passed the Senatus Consultum Ultimum, basically a declaration of emergency, and named Caesar a hostis — a public enemy. Luna: Hostis — that's a stronger word than just 'enemy', isn't it? Lucas: Yes. It meant he had no legal rights. Any citizen could kill him on sight. And yet, when Caesar entered Ariminum, the townspeople didn't resist. They saw him as a popular general, not a traitor. His own troops were loyal — they'd served with him in Gaul for nearly a decade. But the key detail is that Caesar didn't have the whole army with him. He had only the 13th Legion, about five thousand men. The rest were still north of the Alps. So it was a huge gamble. Luna: So he was betting that his name alone would win over the Italian towns? Lucas: Partly. But there was a legal dimension too. Caesar was a proconsul with imperium — military command authority. He argued that the Senate had been subverted by his enemies, especially Cato and Pompey. In fact, two tribunes of the plebs — Mark Antony and Quintus Cassius — had fled to him from Rome, claiming their veto had been overridden. That gave Caesar a constitutional fig leaf: he could say he was defending the tribunes' rights. Luna: Wait — the tribunes fled to him? So they were on his side? Lucas: Exactly. Antony and Cassius had tried to veto the Senate's moves against Caesar, but they were threatened with violence. They escaped in a hired cart, disguised as slaves, and met Caesar at Ariminum. He paraded them to his troops as proof that the Republic's institutions were being trampled. That was masterful PR. Luna: And Pompey — what was he doing while all this happened? Lucas: Pompey was in Rome, but he couldn't muster an army quickly. Most of his veterans were in Spain. He had two legions that had been meant for a campaign in Parthia, but they were under-strength. When news of Ariminum reached Rome, there was panic. The Senate fled. Pompey declared that Rome was being occupied and ordered all magistrates to leave. Many did — including Cato, who saw it as the end of the Republic. Luna: So in a matter of days, the city was abandoned? Lucas: Pretty much. Caesar moved fast. From Ariminum he took Pisaurum, Fanum, Ancona — all within a week. By the time he reached the Adriatic coast, Pompey had already decided to evacuate to Greece. That decision — to abandon Italy — was controversial. But Pompey figured his best chance was to regroup in the east, where he had allies and money. So Caesar effectively took control of Italy without a battle. Luna: No battle? That's surprising for a civil war. Lucas: There was one skirmish at Corfinium, where a Pompeian commander named Domitius Ahenobarbus tried to hold out. But his own troops mutinied and handed him over to Caesar. Caesar famously pardoned him — a calculated move to appear merciful. That mercy became a theme. He wanted to be seen as a reconciler, not a conqueror. But the constitutional reality was that he had started a war by crossing that river. Luna: And the river itself — the Rubicon — was there a ritual to crossing it? Lucas: There's a famous story, probably legendary, that Caesar hesitated at the riverbank, then said 'Alea iacta est' — the die is cast. But the historian Suetonius says he actually quoted a Greek line from Menander: 'Let the die be thrown.' And ancient sources disagree on whether he even said it aloud. What's more significant is the legal act: by crossing with troops, he forfeited his proconsular imperium in the eyes of the Senate. He was now a rebel. Luna: So the crossing itself was the point of no return — but Ariminum was where it became real. Lucas: Exactly. At Ariminum, Caesar addressed his soldiers: he told them that the tribunes had been wronged, that the Senate was a puppet of his enemies, and that he would lead them to victory. He promised each soldier a gift of a hundred denarii — a huge sum for a legionary. That speech, combined with his personal charisma, locked in their loyalty. From that point, the Republic's fate was sealed. Luna: What about the legal term hostis? Did Caesar ever try to get that reversed? Lucas: He did, later. After he took Rome, he had the Senate rescind the decree. But by then, Pompey was building an army in Greece. The hostis label was a propaganda tool — it made Caesar an outlaw, but it also meant that anyone who followed him could be punished. So many senators fled to Pompey, not because they loved him, but because they feared for their lives under Caesar. Luna: It sounds like a very personal feud between a few men, but it tore the whole Republic apart. Lucas: It did. And it's fascinating that the trigger was a small town on the Adriatic. Ariminum was not a grand city like Rome or Capua. It was a colony founded in 268 BCE, a staging post for Roman expansion. But when Caesar took it, he proved that the Senate's authority only extended as far as their armies. And their armies were not in Italy. Luna: So the Senate's great failure was being caught without troops? Lucas: Partly. Pompey had said he could raise an army by stamping his foot — but when the crisis came, he couldn't. Caesar had the only battle-ready forces in Italy. And because he moved faster than anyone expected, he never had to fight a major battle to take control. The civil war would rage for another four years, but the outcome was already hinted at in that first week. Luna: I never realized how much hinged on that one town. It's like the whole Republic pivoted on Ariminum. Lucas: It's a great example of how history hinges on small places at critical moments. The Rubicon crossing is famous, but without Ariminum, Caesar might have been just a rebel with no base. By taking it, he got a foothold, a supply line, and a symbol of his success. And the rest, as they say, is history.