Historian (noun)

A person who studies, writes about, or is an expert in history.

Origin:

Late middle english (denoting a chronicler or annalist): via old french from latin historiarius, from historia (see history).

Examples:

1. His life's work was to become a renowned historian.
2. She's written several books on the topic and is considered a leading historian in her field.
3. His research of the Roman Empire earned him a degree as a historian.
4. They hired a historian to give a lecture on the history of the city.
5. Many of the world's greatest historians have studied at this university.