Law

General
Outlaws and exiles have been around since ancient Roman law, and it's probably less Wild West-y than you think.

Maritime Law
Admiralty law governing maritime questions and offenses (especially important in a Thalassocracy).

Greek and Roman
Standing at the foundation of Roman law: the Laws of the Twelve Tables,Wikipedia.

Starring in the Roman creation myth: Romulus and Remus. Where Italy is settled my Aeneas and R & R arrive 400 years later, the Kings of Alba Longa sit in between.

Xenia, the ancient Greek concept of rules regarding hospitality towards guests.

The 613 Commandments
I mean I guess this could really be in the Religion page but you should read through it there's some crazy stuff in there.

Lost Cause of the Confederacy
I don't even know.