The Chet Ton dynasty (Thai: เชื้อเจ็ดตน; RTGS: Chuea Chet Ton; Thai pronunciation: [tɕʰɯ́a.tɕèt.ton], Northern Thai pronunciation: [tɕɯ́a.tɕĕt.tǒn]; meaning "the dynasty of the seven lords"), also spelled Jedton, or officially Thipphachakkrathiwong[1] dynasty or Thipphachak dynasty in the Royal Society of Thailand's spelling style or Dibayachakkradhiwongse dynasty in Prajadhipok's spelling style (Thai: ราชวงศ์ทิพย์จักราธิวงศ์ or ราชวงศ์ทิพย์จักร) is a dynasty that ruled three northern states of Siam, which consisted of Chiang Mai, the largest, Lampang and Lamphun.