centuriator

from The Century Dictionary.

• noun One of the writers of the Protestant ecclesiastical history known as the Centuries of Magdeburg. Also centurist.

from the GNU version of the Collaborative International Dictionary of English.

• noun rare An historian who distinguishes time by centuries, esp. one of those who wrote the “Magdeburg Centuries.” See under century.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A historian who distinguishes time by centuries, especially one of those who wrote the Magdeburg Centuries.