Prediction markets are everywhere nowadays. You can go online and bet on political outcomes, or the weather, or how long Taylor Swift will stay together with Travis Kelce. But prediction markets have a long history, and one of the earliest involved betting on who would be the next pope. In fact, Renaissance Romans gambled on everything from papal elections to whether a particular noblewoman would give birth to a boy or girl. So why was betting such a big thing in 1500s Italy? How did the papal prediction market actually work? And what can it tell us about prediction markets today? We speak to Ryan Isakow, the author of the No Dumb Ideas substack.

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