A dagger is longer than a dagger and shorter than a sword. Usually it has dual edge and keeps to protect his fist. it was used as a secondary weapon, complementing the sword.
Women also used to carry protection. The earliest daggers appear in the third millennium. C., in the Bronze Age. The materials that were made were bone, ivory and flint.
In all cases, daggers and knives are considered secondary or tertiary arms. The daggers are usually related to the ambiguity. The most famous case of a murder with a dagger was Julius Caesar, Roman dictator who suffered 23 stab wounds, one for each of the members of the Senate. But ironically, daggers are also related to the determination and courage.