The story of the English language began in the fifth century when Germanic tribes invaded Celtic-speaking Britain and brought their languages with them. Later, Scandinavian Vikings invaded and settled with their languages too. In 1066 William I, from modern-day France, became king, and Norman-French became the language of the courts and official activity. People couldn’t understand each other at first, because the lower classes continued to use English while the upper classes spoke French, but gradually French began to influence English. An estimated 45 per cent of all English words have a French origin. By Shakespeare’s time, Modern English had developed, printing had been invented and people had to start to agree on ‘correct’ spelling and vocabulary.