Past tense of antedate: assigned an earlier date than the true date, or occurred before.
From the verb 'antedate' combined with the past tense suffix '-ed', following standard English verb conjugation patterns.
Historical researchers often discover that famous 'ancient' documents were antedated to make them seem older than they actually were, which is why carbon dating and ink analysis became essential tools for authenticating medieval manuscripts.
Complete word intelligence in one call. Free tier — 50 lookups/day.