1) There are boxes of two different colors here, light green versus yellow. I read the Iliad in high school, so I forget if there are actual differences that the creator was attempting to codify. I shouldn't have to look it up, good information design should make that apparent to the unfamiliar viewer.
2) I assume the crosses are meant to signify that the character died at some point? If that's true, perhaps another signifier would be more appropriate, since that seems to the uninitiated to be associated with the death of a Christian person. Since this was written sometime beyond 1,000 B.C.E., I'm going to say that those people weren't Christians.
Would love for someone with the time/ability to edit that map to make these updates.