historian(n = noun.person) historiographer - a person who is an authority on history and who studies it and writes about it;

1.  A writer of history; a chronicler; an annalist. [1913 Webster]

2.  One versed or well informed in history. [1913 Webster]

historian, n.
1 a writer of history, esp. a critical analyst, rather than a compiler.
2 a person learned in or studying history (English historian; ancient historian).

Etymology:
F historien f. L (as HISTORY)

N  description, account, statement, report, expose, specification, particulars, state of facts, summary of facts, brief, return, catalogue raisonne, guidebook, delineation, sketch, monograph, minute account, detailed particular account, circumstantial account, graphic account, narration, recital, rehearsal, relation, historiography, chronography, historic Muse, Clio, history, biography, autobiography, necrology, obituary, narrative, history, memoir, memorials, annals, saga, tradition, legend, story, tale, historiette, personal narrative, journal, life, adventures, fortunes, experiences, confessions, anecdote, ana, trait, work of fiction, novel, romance, Minerva press, fairy tale, nursery tale, fable, parable, apologue, dime novel, penny dreadful, shilling shocker relator, raconteur, historian, biographer, fabulist, novelist, descriptive, graphic, narrative, epic, suggestive, well-drawn, historic, traditional, traditionary, legendary, anecdotic, storied, described, furor scribendi.

N  recorder, notary, clerk, registrar, registrary, register, prothonotary, amanuensis, secretary, scribe, babu, remembrancer, bookkeeper, custos rotulorum, Master of the Rolls, annalist, historian, historiographer, chronicler, journalist, biographer, antiquary, memorialist, interviewer.