Who is the offspring of XXX?
Rama I
Phra Phutthayotfa Chulalok (Thai: พระพุทธยอดฟ้าจุฬาโลก), born Thongduang (Thai: ทองด้วง) and also known as Rama I (20 March 1737 -- 7 September 1809), was the founder and the first monarch of the reigning House of Chakri of Siam (now Thailand).