The Bon religion has undergone two persecutions in Tibet during its long history. The first occurred during the reign of King Drigum Tsenpo (Gri-gum btsan-po`) in the 7th century B.C. All but the “Bon of Cause” (rgyu`i bon: the first four of the Nine Ways) was abolished, and most of its practitioners banished. They were, however, able to conceal many texts as terma (gTer-ma, “treasure”) that were rediscovered at a later date by tertons (gTer-ston, “treasures discoverer”).