The Royal Ploughing ceremony was originally conducted at Phaya Thai rice field. But when the ceremony was reestablished in 2503 B.E., it was then moved to the Sanam Luang Ground that used to be a ceremonial ground in the reign of King Rama I, II, and III. The Phraya Raekna was the minister of agriculture. The four celestial maidens were ladies who work in the royal palace.