were held, were sacrificed. By the end of the eighteenth century, three to four people were sacrificed at the mouth of the Benin River annually, to attract European trade, according to one source. Burials The monarchy of Benin was hereditary; the eldest son was to become the new Oba. In order to validate the succession of the kingship, the eldest son had to bury his father and perform elaborate rituals. If the eldest son failed to complete these tasks, the eldest son might be disqualified from becoming king. Separation of son and mother After the son was installed as king, his mother – after having been invested with the title of Iyoba – was transferred to a palace just outside Benin City, in a place called Uselu. The mother held a considerable amount of power; she was, however, never allowed to meet her son – who was now a divine ruler – again. Divinity of the Oba In Benin, the Oba was seen as divine. The Oba's divinity and sacredness was the focal point of the kingship. The Oba was shrouded in mystery; he only left his palace on ceremonial occasions. It was previously punishable by death to assert that the Oba performed human acts, such as eating, sleeping, dying or washing. The Oba was also credited with having magical powers. Golden Age The Oba had become the mount of power within the region. Oba Ewuare, the first Golden Age Oba, is credited with turning Benin City into a city-state from a military fortress built by the Ogisos, protected by moats and walls. It was from this bastion that he launched his military campaigns and began the expansion of the kingdom from the Edo-speaking heartlands. A series of walls marked the incremental growth of the sacred city from 850 AD until its decline in the 16th century. To enclose his palace he commanded the building of Benin's inner wall, an earthen rampart girded by a moat deep. This was excavated in the early 1960s by Graham Connah. Connah estimated that its construction if spread out over five dry seasons, would have required a workforce of 1,000 laborers working ten hours a day, seven days a week. Ewuare also added great thoroughfares and erected nine fortified gateways. Excavations also uncovered a rural network of earthen walls long that would have taken an estimated 150 million man-hours to build and must have