Fatto generale: 1565 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1565 is a boring number.
Trivia: 1565 is an unremarkable number.
Data storica: April 13th is the day in 1909 that the Turkish military reverses the Ottoman countercoup of 1909 to force the deposal of Sultan Abdul Hamid II.