Fatto generale: 1699 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1699 is a boring number.
Trivia: 1699 is a boring number.
Data storica: August 25th is the day in 450 that Pulcheria becomes empress of the Byzantine Empire after her brother Theodosius II is killed during an hunting accident.