The Anglo-Saxons were a cultural group who inhabited England in the Early Middle Ages. They traced their origins to settlers who came to Britain from mainland Europe in the 5th century. However, the ethnogenesis of the Anglo-Saxons happened within Britain, and the identity was not merely imported. Anglo-Saxon identity arose from interaction between incoming groups from several Germanic tribes, both amongst themselves, and with indigenous Britons. Many of the natives, over time, adopted Anglo-Saxon culture and language and were assimilated. The Anglo-Saxons established the concept, and the Kingdom, of England, and though the modern English language owes somewhat less than 26% of its words to their language, this includes the vast majority of words used in everyday speech. Historically, the Anglo-Saxon period denotes the period in Britain between about 450 and 1066, after their initial settlement and up until the Norman Conquest. The early Anglo-Saxon period includes the creation of an English nation, with many of the aspects that survive today, including regional government of shires and hundreds. During this period, Christianity was established and there was a flowering of literature and language. Charters and law were also established. The term Anglo-Saxon is popularly used for the language that was spoken and written by the Anglo-Saxons in England and southeastern Scotland from at least the mid-5th century until the mid-12th century. In scholarly use, it is more commonly called Old English. The history of the Anglo-Saxons is the history of a cultural identity. It developed from divergent groups in association with the people's adoption of Christianity and was integral to the founding of various kingdoms. Threatened by extended Danish Viking invasions and military occupation of eastern England, this identity was re-established; it dominated until after the Norman Conquest. Anglo-Saxon material culture can still be seen in architecture, dress styles, illuminated texts, metalwork and other art. Behind the symbolic nature of these cultural emblems, there are strong elements of tribal and lordship ties. The elite declared themselves kings who developed burhs (fortifications and fortified settlements), and identified their roles and peoples in Biblical terms. Above all, as archaeologist Helena Hamerow has observed, "local and extended kin groups remained...the essential unit of production throughout the Anglo-Saxon period." The effects persist, as a 2015 study found the genetic makeup of British populations today shows divisions of the tribal political units of the early Anglo-Saxon period. The term Anglo-Saxon began to be used in