English has undergone significant changes over time. It began as Old English around AD 400 and has evolved into contemporary forms of English through various stages. Old English had extensive inflectional morphology that has since been lost. The Norman conquest in 1066 introduced French influences that transformed Old English into Middle English. A major phonological change known as the Great Vowel Shift occurred between Middle and Early Modern English. Contemporary English continues to change and spread globally through both internal language change processes and external social and cultural influences.