Rome.
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In the ocean.
No one has seen them, much less measured them.
Dionysus is a character from Greek Mythology, and it is very obvious that Dionysus is not real. Therefore, he has never-and will never-be seen.
It is said that she is always seen wearing armor and wearing a spear.
At times a Greek god or goddess is not shown to ware any "head piece": but this depends upon the Greek god or goddess. Athena and Ares, being war deities, are sometimes seen adorned with Greek helmets.