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| For years, the historiography of the 14th-century Black Death produced more questions than answers. Then, roughly a decade ago, genomic research confirmed that the medieval Black Death was caused by the same bacteria, Yersinia pestis, which causes the modern bubonic plague. This settled the burning question of precisely which disease had caused the pandemic that produced colossal mortality in many parts of Europe, Asia, and North Africa. In this episode, we speak to Monica H. Green, whose recent work has raised new questions about the Black Death by showing that the chronology of the Black Death was incomplete. As she explains, prior outbreaks of plague in 13th-century Asia occurred at the edges of the ascendant Mongol Empire, roughly a century before the plague arrived in Western Europe. In our conversation, we learn how Green uncovered the new story of the "four Black Deaths" and in doing so, explore the historiography of the Black Death and how genetics, archaeology, and a fresh approach to textual sources have brought us to a deeper understand of one of history's deadliest pandemics.