Synopsis
The Worst Year in History: 536, by Riley Shaw, examines what many historians and climate scientists now identify as the beginning of the most catastrophic decade in human history. The book explores the dramatic and sudden onset of a "volcanic winter" that began in 536 AD, triggered by a massive volcanic eruption—likely in Iceland or the tropics—that ejected a colossal amount of sulfate aerosols into the stratosphere. This veil of ash and dust effectively choked the planet, obscuring the sun and causing global temperatures to plummet, which effectively ended the summer season and sent the world into a state of deep, prolonged climatic shock.
Shaw traces the ripple effects of this disaster, illustrating how the sudden drop in solar radiation crippled agriculture, leading to widespread crop failures and devastating famine across Europe, the Middle East, and Asia. The narrative explains that the resulting environmental instability did not occur in a vacuum but instead acted as a catalyst for a chain of societal collapses. The text details how the ensuing scarcity, combined with the arrival of the Plague of Justinian shortly thereafter, destabilized the Eastern Roman Empire and facilitated the decline of major civilizations, fundamentally altering the trajectory of the ancient world.
Throughout the book, the author synthesizes archaeological evidence with primary historical accounts, such as those from the Byzantine historian Procopius, who famously recorded the sun's lack of brightness during this period. By linking these disparate records, Shaw portrays 536 AD not merely as a single year of bad luck, but as a definitive turning point that ushered in a "Late Antique Little Ice Age." The result is a grim yet compelling look at the fragility of human civilization when faced with rapid environmental change, underscoring how a single year of climate catastrophe can reverberate through centuries of human history.