Have you ever wondered why English pronunciation differs so much from written language?
When was the English language born?
Who invaded Britain?
What were these invaders like? What did they eat and drink? What were they like?
Basically, the history of the English language is dived into tree periods called Old English or Anglo Saxon, Middle English and Modern English. Old English came into being in the 5th century A.D., when the Germanic tribes migrated to England from what are now northern Germany and Denmark.
(In this video you can see how English was evolved)