Butön (Bu ston rin chen grub, 1290–1364), was a Sakya (Sa skya) scholar. His Treasury of Precious Teaching is a history of Buddhism in India and Tibet, completed in around 1326. It is structured in four sections, beginning with an explanation of Buddhism, followed by a history of its development in India, a short history of Buddhism in Tibet, and lastly a section cataloguing the translations of Buddhist texts to which Butön had access. The third section has some material on events and attitudes regarding Tibetan law, particularly in the imperial period.
Chronicle of Bu ston