A Spartans helmet:

Who: the Spartans would where these

What: this was a head piece used for protective properties during war

Where: Spartan helmets were usually found in Rome where the war was being held.

This was during: the roman times of war so right after Greece had ended and Rome began.

Why: I belive that this is an important artifact to this time piriod because there was a lot of war going on then and it was used during war