Moche history is broadly divided into three periods – the emergence of the Moche culture in the Early Moche (AD 100–300), its expansion and florescence during the Middle Moche (300–600), and the urban nucleation and subsequent collapse in the Late Moche (500–750). Moche society was agriculture-based, and the cultural leaders invested in the construction of a network of irrigation canals for the diversion of river water to supply the crops. Their culture was sophisticated; and their artifacts fully express their lives, including scenes of hunting, fishing, fighting, sacrifice, elaborate ceremonies, and sexual acts.