So is (s)he the leader of the 4th imperial legion ?

[lilirulu]

Lucia is most likely Livia because she's 1) a Garlean female 2) with some sort of (negative) past connection to the WoL/Player.

Edit: Another hint towards it is that: Excluding Cid (who did not check her corpse) no other dialogue actually explicitly states she's dead. I made a list pointing towards her being alive somewhere in one of these threads.