When Did the Anglo-Saxons Invade: Key Dates and Historical Context

The Anglo-Saxon invasions of Britain began in 410 CE, when Germanic tribes—Angles, Saxons, and Jutes—crossed the North Sea and launched raids on Roman Britain. The most significant wave occurred between 597 and 616 CE, when King Æthelberht of Kent and later King Æthelred of Kent defeated the Romans and established Anglo-Saxon kingdoms. This period marked the end of Roman rule and the rise of a new political and cultural order in Britain.

Early Raids and Roman Decline

The first major Anglo-Saxon incursion came in 410 CE, when the Romans were already struggling with internal unrest and external threats. The Angles and Saxons, led by Hengist and Horsa, landed in Kent and established a foothold. By 449 CE, the Romans had withdrawn from Britain, leaving behind a power vacuum that the Anglo-Saxons exploited.

While the early raids were sporadic, the 6th century saw a more systematic invasion. The Anglo-Saxons, organized into tribes, began settling in Britain, often displacing or assimilating native Britons. This period is sometimes referred to as the "Heptarchy," a loose alliance of seven kingdoms (Kent, Essex, Sussex, Wessex, Mercia, Northumbria, and East Anglia) that emerged by the late 6th century.

The Definitive Anglo-Saxon Settlement

The decisive shift came in 597 CE, when King Æthelberht of Kent defeated the last Roman forces in Britain. This victory allowed the Anglo-Saxons to consolidate their rule, though Roman influence persisted in some areas. By 616 CE, King Æthelred of Kent expanded his kingdom to cover much of southern England, solidifying Anglo-Saxon dominance.

The Anglo-Saxon kingdoms were not uniform, with Wessex emerging as the most powerful by the 9th century. King Alfred the Great (849–899 CE) played a crucial role in defending the kingdom against Viking invasions, further solidifying Anglo-Saxon rule.

Legacy and Cultural Impact

The Anglo-Saxon invasions reshaped Britain’s political, linguistic, and cultural landscape. The Old English language evolved from the Germanic dialects brought by the invaders, while the Christianization of the Anglo-Saxons introduced a new religious framework. The Domesday Book (1086 CE) later documented the Anglo-Saxon kingdoms’ feudal structure.

While the Anglo-Saxons were not the only invaders—Vikings arrived in the 8th century—their settlements laid the foundation for medieval England. The term "Anglo-Saxon" itself reflects the fusion of Germanic tribes and native British elements, a process that continues to influence modern British identity.