Why Rome actually fell: plagues, slavery, & ice age — Kyle Harper

ℹ️ EPISODE INFO

Released

April 24, 2025

Duration

1h 24m

Channel

Dwarkesh Podcast

Watch on YouTube

▶ Open ↗

📝 EPISODE DESCRIPTION

800 years before the Black Death, the very same bacteria ravaged Rome, killing 60%+ of the population in many areas. Also, back-to-back volcanic eruptions caused a mini Ice Age, leaving Rome devastated by famine and disease. I chatted with historian Kyle Harper about this and much else:

• Rome as a massive slave society
• Why humans are more disease-prone than other animals
• How agriculture made us physically smaller (Caesar at 5'5" was considered tall)

𝐄𝐏𝐈𝐒𝐎𝐃𝐄 𝐋𝐈𝐍𝐊𝐒

• Transcript: https://www.dwarkesh.com/p/kyle-harper
• Apple Podcasts: https://podcasts.apple.com/us/podcast/dwarkesh-podcast/id1516093381?i=1000704767817
• Spotify: https://open.spotify.com/episode/5LhE123eOtQoOm0IPusEiT?si=4d7d8b25374a4f92

𝐒𝐏𝐎𝐍𝐒𝐎𝐑𝐒

• WorkOS makes it easy to become enterprise-ready. They have APIs for all the most common enterprise requirements—things like authentication, permissions, and encryption—so you can quickly plug them in and get back to building your core product. If you want to make your product enterprise-ready, join companies like Cursor, Perplexity and OpenAI, and head to https://workos.com

• Scale’s Data Foundry gives major AI labs access to high-quality data to fuel post-training, including advanced reasoning capabilities. If you’re an AI researcher or engineer, learn how Scale’s Data Foundry and research lab, SEAL, can help you go beyond the current frontier of capabilities at https://scale.com/dwarkesh To sponsor a future episode, visit https://dwarkesh.com/advertise. 𝐊𝐘𝐋𝐄'𝐒 𝐁𝐎𝐎𝐊𝐒

• The Fate of Rome: https://www.amazon.com/Fate-Rome-Climate-Disease-Princeton/dp/0691166838
• Plagues upon the Earth: https://www.amazon.com/Plagues-upon-Earth-Princeton-Economic/dp/069119212X
• Slavery in the Late Roman World: https://www.amazon.com/Slavery-Late-Roman-World-275-425/dp/0521198615

I highly recommend all of these. Kyle is also working on a new book called The Last Animal. Stay tuned for the release! 𝐓𝐈𝐌𝐄𝐒𝐓𝐀𝐌𝐏𝐒 00:00:00 - Plague's impact on Rome's collapse 00:07:08 - Rome’s little Ice Age 00:12:35 - Why did progress stall in Rome’s Golden Age? 00:24:39 - Slavery in Rome 00:37:06 - Was agriculture a mistake? 00:48:26 - Disease’s impact on cognitive function 01:00:30 - Plague in India and Central Asia 01:06:00 - The next pandemic 01:17:32 - How Kyle uses LLMs 01:19:35 - De-extinction of lost species

🎤 SPEAKERS

• Kyle Harper

  guest

• Dwarkesh Patel

  host

• Narrator

  other

🧾 EPISODE SUMMARY

In this episode of Dwarkesh Podcast, featuring Kyle Harper and Dwarkesh Patel, Why Rome actually fell: plagues, slavery, & ice age — Kyle Harper explores plagues, climate shocks, and slavery: rethinking why Rome collapsed Historian Kyle Harper explains how Rome’s fall was deeply shaped by biology and climate—especially the Plague of Justinian and a sixth‑century volcanic cold snap that devastated agriculture and population. He contrasts Rome’s sophisticated markets and finance with its weak scientific culture to argue why an industrial revolution was unlikely there, even absent collapse. The conversation then turns to Rome as a slave society, what sustained large‑scale slavery and limited revolts, and why slavery likely didn’t block industrialization. Finally, Harper broadens out to the long history of disease, the forager‑to‑farmer transition, modern public health, evolutionary weirdness in pathogens, synthetic biology risks, AI as a research tool, and the ethics of extinction and de‑extinction.

🔗 RELATED EPISODES

David Reich – Bronze Age shock, the Neanderthal puzzle, & the sudden spread of farming

Jensen Huang – TPU competition, why we should sell chips to China, & Nvidia’s supply chain moat

Dario Amodei — “We are near the end of the exponential”

Andrej Karpathy — “We’re summoning ghosts, not building animals”

Why Leonardo was a saboteur, Gutenberg went broke, and Florence was weird – Ada Palmer

Richard Sutton – Father of RL thinks LLMs are a dead end