Comparing ancient societies allows us to observe the variety of relationships that prevailed between states — in different forms and at different scales — and their complex legal environments. This chapter explores five dimensions of this relationship. First, we examine the capacity of law to shape state power. While constitutional law, strictly speaking, was comparatively rare in the ancient world, we can yet observe various ways in which law, law-like practices and other cultural norms operated collectively to both empower and constrain the state. The second and third parts of the chapter look at the inverse relationship: state power over law and legal practice in the form of legislative powers and jurisdiction, respectively. In the fourth part, we turn from ideational aspects of state law to the structure of state legal systems themselves, particularly in the context of private or non-state legal practices. Here we focus on those domains of law in which the state was most intimately engaged, what was left to non-state actors and the engagements between both across a sometimes indistinct boundary. The final part of the chapter explores the role of law in legitimizing state power.