general_fact: 12331 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 12331 is an uninteresting number.
trivia: 12331 is an uninteresting number.
historical_date: October 4th is the day in 610 that Heraclius arrives by ship from Africa at Constantinople, overthrows Byzantine Emperor Phocas and becomes Emperor.