What was hammurabi's most important achievement as the ruler of babylon? responses he was responsible for a codification of laws that influenced later societies. he was responsible for a codification of laws that influenced later societies. he appointed governors to rule over conquered cities. he appointed governors to rule over conquered cities. he established permanent armies, which he used to control his empire. he established permanent armies, which he used to control his empire. he built extensive canals, which carried water to many parts of his kingdom.