THESAURUS
historical
absolute, actual, admitting no question, ascertained, attested, authentic, authenticated, autobiographical, biographical, categorically true, certain, certified, chronologic, confirmable, confirmed, corroborated, de facto, demonstrable, demonstratable, demonstrated, determined, documentary, documented, effectual, established, factual, for real, genuine, hagiographic, historic, historied, historiographic, honest-to-God, inappealable, incontestable, incontrovertible, indisputable, indubitable, irrefragable, irrefutable, legendary, martyrologic, not in error, objectively true, positive, provable, proved, real, recorded, reliable, self-evident, substantial, substantiated, sure-enough, testable, traditional, true, true as gospel, truthful, unanswerable, unconfutable, unconfuted, undeniable, undenied, undoubted, unerroneous, unfallacious, unfalse, unimpeachable, unmistaken, unquestionable, unrefutable, unrefuted, validated, veracious, verifiable, verified, veritable