The story of Wat Ratchanatdaram begins in the year eighteen forty-six during the reign of King Rama the Third, formally known as King Nangklao. Deeply devoted to his family and Buddhism, the monarch commissioned this grand temple complex in honor of his beloved granddaughter, Princess Somanass Waddhanawathy, who would later become queen consort to King Rama the Fourth. Royal temple construction was customary in Siamese statecraft, but King Rama the Third envisioned something extraordinary for this compound. Rather than constructing a traditional rounded chedi to crown the temple courtyard, the king took inspiration from ancient Buddhist lore and decreed that a multi-tiered metal palace should rise in its place. To realize this grand design, he appointed top court administrators: Chao Phraya Yommaraj, who established the master layout and directed the construction of the ordination hall and assembly pavilions, and Chao Phraya Sri Phiphat, who oversaw the technical engineering of the Loha Prasat. Though King Rama the Third passed away before the vast project was completed, the grand foundation he laid endured through generations of careful restoration.