pseudohistory

English

pseudo- +‎ history, coined around 1815, after New Latin pseudo-historia (since 1654 or earlier according to OED).

pseudohistory (countable and uncountable, plural pseudohistories)

Any work that claims to be history, but does not use established historiographical methods; especially one that uses disputed evidence and speculation rather than relying on the analysis of primary sources
The contemptible trick practised by Mr. Anderson, in the first chapter of his pseudo-history, must not pass without due correction. (The Critical review: or, Annals of literature, Volume 1, ed. Tobias George Smollett, 1815, p. 152)

any work that claims to be history, but does not use established historiographical methods