The Anglo-Saxons were the dominant people living in England from the mid-5th century AD until the Norman conquest in 1066. They spoke Germanic languages and are identified by Bede as the descendants of three powerful tribes. These were the Angles, Saxons, and Jutes. Their language, Anglo-Saxon or Old English, came from West Germanic dialects. It changed into Middle English from about the 11th century. Old English was divided into four main dialects: West Saxon, Mercian, Northumbrian and Kentish. 

The Anglo-Saxon culture replaced the Celtic culture in the area that is now England. Modern historians do not think that the Anglo-Saxons drove the Celts away, but instead that they became an upper class to the Celts in England, and the Celts then became part of the Anglo-Saxon culture. They never conquered Wales but Anglo-Saxon kings did claim overlordship from time to time. Some Anglo-Saxons came to Britain as warriors, but others came peacefully to become farmers or to raise families.

Anglo-Saxon migration 
It is not known how many Anglo-Saxons actually came to Britain between the 4th and 6th century AD. Many sources say large numbers of Anglo-Saxon settlers arrived. Because of this, some of the native Britons moved west, towards Wales and Cornwall. Others went to Armorica and became the Bretons. The language of the Anglo-Saxons, Old English, became the main language in southern Britain. A few Celtic and Latin words were borrowed into Old English.

In the areas such as Kent, Sussex, Essex, Suffolk and Norfolk, many of the native Britons may have been driven out. In other areas, some Britons likely remained and were absorbed into Anglo-Saxon society. In 2011, a historian suggested that about 1 or 2 Anglo-Saxons came to England for every 10 Celts that were already there.

Angles, Saxons and Jutes 
It was Bede who identified the invaders as Angles, Saxons and Jutes. But he sometimes used the names Angli and Saxones for the same people in different parts of his writings.  In Book I, Chapter 15 he said that by invitation of King Vortigern "Angles or Saxons" came to Britain in three longships. Modern authorities confirm that Angles, Saxons, Frisians and some Jutes did come to England during this migration time period. The differences between the tribes that moved to England were not significant. Kent was different in culture from other parts of England, mostly because it had close contact with parts of Europe such as Gaul. 

Certain styles of jewellery are recognized by archaeologists as being typical of Anglian, Saxon and Jutish areas in Northern Europe. But why the name England came to be used for the country and English for the language is not clear. In Old English the people called themselves Engle, and in Latin they were called Angli, but nothing suggests the Angles made up the largest percentage of the Germanic peoples in Britain. The name Englaland, which became 'England' was regularly used by the 11th century.

Celtic words for the Anglo-Saxons 

The native British people, who wrote in both Latin and Welsh (a Celtic language), referred to these invaders as Saxones or Saeson. The latter name is still used today in the Welsh word for English people, Saeson, the English language, Saesneg, and things related to England, Seisnig. In the Scottish Gaelic language the word for an English person is sasannach and in Irish the word is sasanach.

Art 

Anglo-Saxon art before the time of Alfred (who ruled from 871–899) is a mixture of Anglo-Saxon and Celtic techniques and styles. The Sutton Hoo treasure is an excellent example of very early Anglo-Saxon metalwork and jewellery. It came from  a royal grave of the early 7th century. The period between Alfred and the Norman Conquest saw a distinct Anglo-Saxon style in art. This was due in part to the revival of the English economy and culture after the end of the Viking raids. This later style appears to have been in touch with trends in western Europe.

Anglo-Saxon art is mainly known today through illuminated manuscripts. Manuscripts were not the only Anglo-Saxon art form, but they have survived in much greater numbers than other types of objects. People in Europe at the time regarded Anglo-Saxon goldsmithing and embroidery as especially fine. The most common examples of Anglo-Saxon art are coins. Anglo-Saxon artists also worked in fresco, ivory, stone carving, metalwork and enamel, but few of these pieces have survived.

Literature
Old English literary works include epic poetry, biography, sermons, Bible translations, legal works, chronicles, riddles and others. In all there are about 400 surviving manuscripts from the period.

A very famous work from this period is the poem Beowulf. It has achieved national epic status in Britain. The Anglo-Saxon Chronicle is a collection of important early English history. Cædmon's Hymn from the 7th century is the earliest attested literary text in (Old) English. One of the most valuable and important sources on Anglo-Saxon history is Bede's Ecclesiastical History of the English Nation.

References

Other websites 
 On the origins of Britons -  according to Brian Sykes
 Fides Angliarum Regum: the faith of the English kings
 Anglo-Saxon origins: the reality of the myth  by Malcolm Todd

Germanic tribes