General fact: 715 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 715 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 715 is an uninteresting number.
Historical date: December 15th is the day in 533 that Byzantine general Belisarius defeats the Vandals, commanded by King Gelimer, at the Battle of Ticameron.