historian (n.)

late 14c., "relation of incidents" (true or false), from Old French estoire, estorie "story; chronicle, history" (12c., Modern French histoire), from Latin historia "narrative of past events, account, tale, story," from Greek historia "a learning or knowing by inquiry; an account of one's inquiries; knowledge, account, historical account, record, narrative," from historein "be witness or expert; give testimony, recount; find out, search, inquire," and histōr "knowing, expert; witness," both ultimately from PIE *wid-tor-, from root *weid- "to see," hence "to know."

Thus it is related etymologically to Greek idein "to see," eidenai "to know," and to idea and vision. Beekes writes of histōr that "The word itself, but especially the derivations ... that arose in Ionic, have spread over the Hellenic and Hellenistic world together with Ionic science and philosophy." 

In Middle English it was not differentiated from story (n.1); the sense of "narrative record of past events" probably is first attested late 15c. The modern meaning "recorded events of the past" is from late 15c., as is use of the word in reference to a branch of knowledge. The meaning "a historical play or drama" is from 1590s.

The sense of "systematic account (without reference to time) of a set of natural phenomena" (1560s) is now obsolete except in natural history (as late as the 1880s published county histories in the U.S. routinely included natural history chapters, with lists of birds and fishes and illustrations of local slugs and freshwater clams). The meaning "an eventful career, a past worthy of note" (a woman with a history) is from 1852. To make history "be notably engaged in public events" is from 1862.

History is the interpretation of the significance that the past has for us. [Johan Huizinga, "The Task of the Cultural Historian"]

History is more or less bunk [Henry Ford, Chicago Tribune, May 25, 1916]

One difference between history and imaginative literature ... is that history neither anticipates nor satisfies our curiosity, whereas literature does. [Guy Davenport, "Wheel Ruts," 1996]

c. 1400, "having power to control fate," from wierd (n.), from Old English wyrd "fate, chance, fortune; destiny; the Fates," literally "that which comes," from Proto-Germanic *wurthiz (source also of Old Saxon wurd, Old High German wurt "fate," Old Norse urðr "fate, one of the three Norns"), from PIE *wert- "to turn, to wind," (source also of German werden, Old English weorðan "to become"), from root *wer- (2) "to turn, bend." For the sense development from "turning" to "becoming," compare phrase turn into "become."

The sense of "uncanny, supernatural" developed from Middle English use of weird sisters for the three Fates or Norns (in Germanic mythology), the goddesses who controlled human destiny. They were portrayed as odd or frightening in appearance, as in "Macbeth" (and especially in 18th and 19th century productions of it), which led to the adjectival meaning "odd-looking, uncanny" (1815); "odd, strange, disturbingly different" (1820). Also see Macbeth. Related: Weirdly; weirdness.

"petty or contemptible historian," 1887, from historian with ending altered to -aster. Coined by W.E. Gladstone, in a review of J. Dunbar Ingram's "History of the Legislative Union of Great Britain and Ireland."