Early Medieval England, often referred to as the Anglo-Saxon period, lasted from the 5th to the 11th century. This era began after the fall of the Roman Empire and saw the arrival of various tribes, including the Saxons, Angles, and Jutes. These groups established several kingdoms, such as Mercia and Wessex, and developed a unique culture, language, and legal system. During this time, Christianity spread throughout England, largely due to the efforts of missionaries like St. Augustine. The period was marked by significant events, including the Viking invasions, which led to the establishment of the Danelaw. By the late 10th century, England began to unify under a single monarchy, setting the stage for future developments.