I'm pretty sure Kashyk is talking about that bust here:
KASHYK: It seems you have a long-standing obsession with exploration, Captain. I, on the other hand, have much more in common with this ancient soldier.
JANEWAY: He's from Earth's classical period. It produced some of our greatest artists as well.
Though I might be wrong, I'd have to get the dvd out. But none the wiser as to who it is