A comprehensive history of West Tibet from the 10th to the 15th century, a period covered by a long-lost manuscript (mNga'.ris rgyal.rabs, by Gu.ge mkhan chan Ngag.dbang grags.pa), the only known source dealing systematically with the history of these kingdoms. The book relates the rise and fall of Buddhist sovereigns, their wide-ranging contacts with surrounding civilizations, and their close links with central Tibet. Genealogies of dynasties, political and religious laws issued by its rulers and narrative accounts are presented.