Many-Treasures Buddha is said to be a Buddha from the far distant past. Buddhism in general expounds that numerous Buddhas appeared one after the other throughout the ages before Sakyamuni. By presenting Sakyamuni and Many-Treasures Buddha sitting side by side in the Stupa of Treasures, the Sutra implies that the present Buddha (Sakyamuni) and the past Buddha (Many-Treasures) are united as one single entity.
Introduction to the Lotus Sutra