If you come from a country that practises civil law (where a written legal code holds sway), then you must spend first spend a year getting a Master of Laws at an American university.

Although we don't know much about Sumerian law, scholars agree that the Code of Hammurabi, written by a Babylonian monarch, reproduces Sumerian law fairly exactly.

In the Spring and Autumn and Warring States periods (770-221 BC), written law was promulgated in China, and a systematic written code of laws appeared.