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Gildas (AD 450 or 500-c570) is foundational for understanding the collapse of Roman Britain because he is the earliest surviving British voice describing the period after Rome withdrew. Every later medieval historian—Bede, Nennius, the Anglo‑Saxon Chronicle—depends on him. Without Gildas, our picture of 5th‑century Britain would be dramatically thinner. This article explains how medieval Britons remembered the fall of Roman Britain, focusing on the 6th‑century writer Gildas, whose account shaped all later narratives. It shows that medieval memory of Rome’s departure blended history, trauma, and legend, and that some of Gildas’s claims align with contemporary Roman sources. Gildas wrote De Excidio Britanniae (shown above) around AD 540, making him the first British author to describe the post‑Roman world from inside Britain rather than from Rome or Gaul. No earlier British chronicles survive from the period of AD 410–540. Gildas identifies the usurper Maximus (AD 383) as the figure who removed Britain’s troops, effectively beginning the end of Roman rule. He highlights the AD 410 message from Emperor Honorius telling Britons to defend themselves, marking the official end of Roman administration: Gildas writes that after repeated appeals for military help, “the Romans told them to look to their own defence, and no longer to expect help from them,” a line that marks the moment Britain was formally abandoned and forced to face Saxon pressure without imperial protection. Gildas describes the later Battle of Mount Badon (around AD 495 or 500) as a decisive victory in which the Britons defeated the Saxons, ending decades of warfare and ushering in a generation of peace. https://share.google/xievpPhoTFyOUWTmJ