Mongkut (มงกุฎ crown[6]) was the second son of Prince Isarasundhorn, son of Buddha Yodfa Chulaloke, the first Chakri king of Siam (King Rama I) and Princess Bunreod. Mongkut was born in the Old (Thonburi) Palace in 1804, where the first son had died shortly after birth in 1801; joined by Prince Chutamani (เจ้าฟ้าจุฑามณี) in 1808. In 1809, Prince Isarasundhorn was crowned as Buddha Loetla Nabhalai (later styled King Rama II.) The royal family then moved to the Grand Palace. Thenceforward until their own accessions as kings, the princes (เจ้าฟ้า chaofa) were called Chao Fa Yai (เจ้าฟ้าใหญ่) and Chao Fa Noi