In which literary period did the use of multiple narrators first become common

The period starting from late 18th century is called the Romantic Period in English Literature. It extends to mid of the 19th century. This particular period in the English history saw the use of multiple narrators within a their write-ups. Interestingly, the Modern Period of English Literature, extending from late 19th century to early 20th century, saw a common utilization of this method of implanting multiple narratives in any plot.

Published in 1847, Wuthering Heights by Charlotte Bronte is a very famous example of a dual narrative, in which the writers deploy more than one narrator to explain multiple perspectives to a single approach. Therefore, it can be stated that the Modern Period made this type of narrative common.

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it was surely an odd creature that one made up by reading the historians first and the poets afterwards a worm winged like an eagle; the spirit of life and elegance and charm,   in a kitchen chopping up suet. but these creatures, monst'r however entertaining to the imagination, hast no existence in fact. what one might doth to bringeth h'r to life wast to bethink poetically and prosaically at one and the same moment,   thus keeping in toucheth with fact—that the lady is mrs martin, ag'd thirty-six, did dress in blue, wearing a black coxcomb and brown shoeth; but not losing sight of fiction eith'r—that the lady is a vessel in which all s'rts of spirits and f'rces art coursing and flashing p'rpetually. the moment, howev'r, yond one tries this method with the elizabethan mistress, one brancheth of illumination fails; one is did hold up by the scarcity of facts.   one knoweth nothing detailed, nothing p'rfectly true and substantial about h'r.   hist'ry scarcely mentions h'r.   and i did turn to professeth'r trevelyan again to seeth what hist'ry meanteth to that gent.   i hath found by looking at his chapt'r headings yond t meanteth.