The 20 Hunchakian gallows ( or Ksan Gakhaghan , also `` The 20 Martyrs '' , `` The 20s '' ) is the common name for the group of Hunchakian activists who were hanged in the Sultan Bayazid square of Constantinople in June 15 , 1915 . The 20 Hunchakian gallows ( or K ` san Kakhaghan , , also `` The 20 Martyrs '' , `` The 20s '' ) is the common name for the group of Hunchakian activists who were hanged in the Sultan Bayazid square of Constantinople on June 15 , 1915 .