I was playing Alexander the other day, and noticed he had some bonuses that were not explicitly listed under "Hellenic League".  It states that he gets double bonus increases and half penalty decreases when dealing with city-states, which is nice and all, but not huge. 
 
However, while playing a game as Alexander, I noticed that it also allowed me to travel through all city-states borders freely, even though I was neutral with them.  It specifically said it was due to my leader's special trait.   
 
Has anyone else discovered any hidden civ traits that aren't directly listed under the tooltip for the trait?

It was listed in the demo. huh, that's partly why I play Alexander.

Hmm, I wonder where we can find a list of these?