Over the 4 centuries following the Norman Conquest of 1066, the English language changed dramatically as approximately 10,000 French words entered Old English and many Old English words left. Around 1,000 Latin words were also incorporated into English mainly through John Wycliffe's translation of the Bible from Latin to English in the late 14th century. These significant changes resulted in the language being called Middle English rather than Old English. Some key changes included nouns, adjectives and pronouns losing different meanings and becoming simpler, and irregular past tense verbs decreasing in number.