A-mes-zhabs was a stroke of luck for the Sakyapa school of Tibetan Buddhism. This catalogue provides an access to his ca. 700 newly discovered manuscripts, many of which will serve researchers as meticulous introductions to the lives and teachings of numerous Sakyapa masters and to the history especially of the Sakya tradition and of tantric cycles of teachings such as Hevajra, Lam bras, Yamantaka, Guhyasamaja, the Yoga tantras, and many more. A-mes-zhabs, an outstanding historian, is for the Sakyapas what Jamgön Kongtrul has been for the Nyingma and Kagyü traditions.