Rivers, Silk roads and camels - how did international trade adapt and survive beyond the Roman Empire into the middle ages? In today's episode Cat is joined by author Hilary Green to talk about her debut non-fiction book, "International Trade in the Middle Ages". Together they examine products like wool, silk, spices and salt - items we take for granted now, but materials that were once symbolic of status and wealth. What were the secret routes taken and how do we know about their journeys?

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