Fatto generale: 1258 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1258 is the number of commutative asymmetric semigroups of order 6.
Trivia: 1258 is an unremarkable number.
Data storica: June 11th is the day in 1903 that Group of Serbian officers stormed royal palace and assassinated King Alexander Obrenović and his wife queen Draga.