Wiktionary
n. 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
Wikipedia
Pseudohistory is produced by the application of the research techniques of the historical method ( primary sources and evidence) characteristic of legitimate history; yet, in itself, the work of pseudohistory is intellectually inconsistent with the historical record and with the common-sense understanding held in the collective memory of society. In practice, a pseudohistory presents a big lie—sensational claims—about historical fact that would require the revision (re-writing) of the historical record. The term pseudohistory is applied to works of historical revision that are based upon or derived from a theory or upon a re-interpretation or both; moreover, the related term cryptohistory applied to a pseudohistory based upon or derived from the superstitions inherent to occultism.