past in an effort to support their own initiatives and define their images for posterity. Although only popularly known to Western audiences after the Benin Expedition of 1897, Benin art has been in existence since at least the 13th century. Ancestral altars A newly installed Oba is responsible for creating an altar dedicated to his father, commissioning the appropriate objects to adorn it and activating it on a regular basis with sacrifices of food or animal blood. The Oba does the same for his mother if she attained the title of iyoba, or queenmother. While bells and rattle staffs are placed on all ancestral altars, ivory tusks and commemorative brass heads are made specifically for royal altars. Associated with trade, ivory and brass are durable and valuable, and their colors—white like sacred kaolin clay and red like fire and coral beads—relate to royal power. Before the British conquest, an Oba's courtyard was the focal point for rituals in his honor. British troops reported 18 altars dedicated to previous Obas when they took possession of the palace in 1897. Today, all of the royal altars stand together in a single courtyard. One of the objects unique to Benin art is an Ikegobo, or "altar to the hand," which celebrates the accomplishments of exceptional individuals. The hand is associated with action and productivity, and is considered the source of wealth, status, and success for all those who depend on manual skill and physical strength. Altars of this kind are commissioned in terracotta, wood, or brass, depending on the status of the patron. Art related to rituals at court Private and public ceremonies mark many of the important moments in Benin's yearly calendar. In the past, an elaborate series of rites were performed throughout the year to secure otherworldly support for the kingdom's well-being and to celebrate decisive events in its history. For the sake of convenience, the current monarch, Oba Ewuare II, emphasizes the end-of-year festival called Igue, which is held during the winter holidays to allow the greatest number of people to attend. Igue includes a sequence of rituals that renew the Oba's supernatural powers and cleanse the kingdom's unruly spirits. Benin's other important ritual festivals include Ague, where the first budded yams are blessed in hopes of a successful harvest; Ugie Ivie, the Festival of Beads, in which the Oba's coral and red stone regalia is bathed in cow's blood