The Anglo-Saxons were a group of Germanic peoples who migrated to Great Britain in the early 5th century CE, after the Roman withdrawal from the island. They primarily consisted of three tribes: the Angles, Saxons, and Jutes, who originated from regions that are now modern-day Denmark, northern Germany, and the Netherlands. They established several kingdoms in central and southern Britain, which later consolidated into a unified kingdom under King Æthelstan in the 10th century. The Anglo-Saxon era, spanning from about 410 to 1066, significantly shaped early English culture, language, law, and Christianity. Their time ended with the Norman Conquest in 1066, marking a major transition in English history.