Prasat Phra Thep Bidon, the Royal Pantheon, is the largest building on the upper platform. It was built in 1855 by Rama IV as the original home of the Emerald Buddha, but he died before Prasat Phra Thep Bidon was completed. Rama V did not think it was big enough for a royal congregation, so he built the Temple of the Emerald Buddha instead. To make use of the magnificent structure his predecessor had built, Rama V put a gilt stupa that had belonged to Rama IV inside as homage to the man who had built it. During the reign of Rama IV, the original building burned down, but Rama VI restored the building to its original specifications and placed life-sized statues of all of his predecessors. The tradition has been kept up and there are statues of every Rama of the Chakri Dynasty inside the Royal Pantheon. This building is closed to the public every day except for April 6th, which is Chakri Day.