Possible Clues:

• Did they investigate who stabbed Julius Caesar? Sounds like something you'd read at the bar years ago!
• System of jurisprudence of an ancient Italian city
• Student from Arab country in conflict returned Justinian's code
• In old Italy they were reading it at the bar that The Script is in California with One Direction?
• Classical legal code
• Lex
• That's what Lex is
• The Twelve Tables' contents