The north of Peru retains traces of some of the most fascinating cultures of the period prior to the Europeans. Important discoveries, such as the royal tombs of Sipan in 1987 and the recent Tomb of the Lady of Cao make this area a paradise for archaeology. The Mochica culture (100-800 AD.) It was able to leave unique architectural relics such as temples for ceremonies, hydraulic engineering works of great refinement, and especially the fine ceramics, considered the best of ancient Peru. The followers of the god Ai-apaec formed a hierarchical society proud and powerful. The duality, always present in the Mochica's philosophy, summarizes the nature of this culture, which was later swallowed up by the Lambayeque culture.