Do forts work the same as cities as well??
Here's a difficult one.
What connects the following civs: Celtia, Japan, Ethiopia and Rome? America may qualify as well... Boudica is the only female leader in the game with this feature anyway...
EDIT: I'm going to rule out America because of Washington.
EDIT2: I'm surprised Rome qualifies, I thought they would be disallowed for the same reason Alexander of Greece doesn't qualify.