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 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 3 northern states of Siam, which consisted of Chiang Mai, the largest, Lampang and Lamphun.