How a Third-Century Historian Calculated the Age of the World and Rebuilt a City

Ideas & Philosophy · Published 3 October 2026 Swipe more like this →

In short: Sextus Julius Africanus was a polymath who navigated the worlds of Roman military service, Christian theology, and ancient science. From calculating the timeline of Creation to securing the restoration of his home city, his influence on early Church historians remains profound, even as his own life stays shrouded in mystery.

Sextus Julius Africanus, a Christian historian active in the late 2nd and early 3rd centuries, remains an enigmatic figure. While some traditions place his life under the reign of Emperor Severus Alexander, others associate him with Gordianus III. Born perhaps in Jerusalem and residing in Emmaus, he was a man of diverse talents, fluent in Greek, Latin, and Hebrew. His career spanned roles as a soldier, a traveler to Alexandria, and an ambassador who successfully petitioned for the reconstruction of his ruined hometown, which was subsequently renamed Nicopolis.

His most significant contribution, the five-volume Chronographiai, attempted to map human history from Creation to 221 AD. Africanus calculated that 5,500 years had elapsed between Creation and the Incarnation, a framework that heavily influenced later Greek Eastern Mediterranean chronologies. Beyond history, he engaged in rigorous intellectual debates, such as his correspondence with Origen regarding the authenticity of the story of Susanna in the Book of Daniel, and his efforts to reconcile the conflicting genealogies of Christ through the lens of Levirate marriage law.

The attribution of another work, the Kestoi, remains a subject of scholarly debate. This encyclopedic collection covers disparate subjects ranging from military tactics and medicine to agriculture and natural history. Critics have questioned its authorship due to its secular and often credulous tone, leading some to suggest it was written during his pre-Christian life. Despite these questions, fragments of his work, preserved by later chroniclers like Eusebius and Georgius Syncellus, continue to provide vital insights into the intellectual landscape of the early Christian world.

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