Typically, slaves would travel from different countries on boats known as "slave ships." The quality of these ships were extremely poor, because the slaves were all crammed inside the boat. Many of the slaves would die on voyages to different countries.
the Buddhism and Confucianism have had an impact on China for about two thousand years or so! In fact, Chinese culture is rooted in these two philosophies and their impact on Chinese life and economics is pretty deep!
"Justinian Code" is the "Collections of Laws and Legal Interpretations" developed under the sponsorship of the Byranztine Emperor "Jutinian" [ That's why it named after him] from time A.D. 529 to A.D.565
Hope this helps!