The Saxon Invasions refer to a series of migrations and invasions by Germanic tribes, primarily the Saxons, Angles, and Jutes, into Britain during the 5th and 6th centuries. These groups sought new lands and resources after the decline of the Roman Empire, leading to significant changes in the region's culture and demographics. As the Saxons settled in Britain, they established several kingdoms, including Wessex, Mercia, and Northumbria. This period marked the beginning of the Anglo-Saxon era, which laid the foundation for the English language and culture. The invasions ultimately contributed to the formation of modern England.