Early French history was written in Latin. Later, after Latin was gradually localized, French came into being, and the official language of France became French, so the history of France was written in French. French is a relatively standard language in ancient Europe, which was used by court nobles and scholars in many countries.

Germany was a holy Roman Empire in the early days, which continued many systems of the Roman Empire. At that time, Germany was not unified, so there was no official German, and the history of the country was written in Latin. Later, French was gradually used to write history.

After England was conquered by Caesar, Latin was used as its own writing, and was later conquered by William, Duke of Normandy. Deeply influenced by French culture, it began to use French as the official language. So far, French is the official language of Britain. So the history of ancient Britain should also be written in Latin and French.