In the fifth century, as Rome's empire fractured, Britain stood at the edge of history. Flavius Aetius, Ambrosius Aurelianus and Early Post‑Roman Britain examines the twilight of Roman rule and the emergence of new leaders who defended a fragile land against Saxon incursions. Elizabeth Legge brings together archaeology, historiography, and reception history to illuminate figures often shrouded in legend. Flavius Aetius, the "last of the Romans," and Ambrosius Aurelianus, remembered by Gildas as Britain's champion, are set against the backdrop of Cadbury Castle, Armorica, and the Battle of Badon. Drawing on villa discoveries, mosaics, and fortifications, this study anchors myth in material evidence, showing how continuity and collapse intertwined in Britain's long transition. This is a living book: a work that will grow with new essays, illustrations, and scholarly expansions. It invites readers into an evolving conversation about identity, resilience, and the echoes of Rome in Britain's early medieval dawn. For historians, archaeologists, and enthusiasts of Arthurian origins, this volume offers both rigorous synthesis and narrative richness. It situates Britain within the wider currents of Late Antiquity — politics, medicine, war — while foregrounding the local landscapes and leaders who shaped its destiny. Whether read as a standalone study or alongside Legge's Echoes of Ancient Rome series, this book provides a compelling lens on the twilight of empire and the birth of a new world.