For the 300 years following the Norman Conquest in 1066, the Norman kings and the high nobility spoke only a variety of French. A large number of Norman words were assimilated into Old English, with some words doubling for Old English words (for instance, ox/beef, sheep/mutton). The Norman influence reinforced the continual evolution of the language over the following centuries, resulting in what is now referred to as Middle English. Among the changes was a broadening in the use of a unique aspect of English grammar, the "continuous" tenses, with the suffix "-ing". During the 15th century, Middle English was transformed by the Great Vowel Shift, the spread of a standardised London-based dialect in government and administration, and the standardising effect of printing. Modern English can be traced back to around the time of William Shakespeare. The most well-known work from the Middle English period is Geoffrey Chaucer's The Canterbury Tales.

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