The document summarizes the Middle English period from 1150 to 1400. It describes how William the Conqueror's invasion in 1066 established Norman rule in England and made French the dominant language. English regained prominence in the late 13th century. Early literary works were often religious in nature and written by monks to spread religious teachings. Geoffrey Chaucer and William Langland were two of the most famous authors of the period, with Chaucer's Canterbury Tales being one of the defining works of Middle English literature. French influences also remained strong during this time period in terms of vocabulary, genres, and literary styles.