Three decorative panels on the drum of this spectacular stūpa depict key moments in the Buddha's life: his renunciation, enlightenment, and death. At the center is the Great Departure, represented as a riderless horse passing through a tall gateway, alluding to the start of Prince Siddhārtha's life as a mendicant (wandering ascetic). The profile of the horse draws directly from images on Roman coins then in circulation in southern India. The empty throne beneath a tree at left is a metaphor for the Buddha's awakening at Bodhgaya, while the domed shrine on pillars at right houses the tooth relic, a symbol of the Buddha's passing. These three scenes thus celebrate the seminal moments in the Buddha's life.