In accordance with tradition, the palace was initially referred to only as the Phra Ratcha Wang Luang (พระราชวังหลวง) or 'Royal Palace', similar to the old palace in Ayutthaya. However, during the reign of King Mongkut (Rama IV) the name Phra Boromma Maha Ratcha Wang or 'Grand Palace' was first used in official documents. This change of name was made during the elevation of Prince Chutamani (the king's younger brother) to the title of Second King Pinklao in 1851. The proclamation of his title described the royal palace as the 'supreme' (บรม; Borom)[1] and 'great' (มหา; Maha)[1] palace. This title was given in order to distinguish the palace from the Second King's palace (the Front Palace), which was described as the Phra Bovorn Ratcha Wang (พระบวรราชวัง) or the 'glorious' (บวร; Bovorn)[17] palace.