The following are excerpts from a recent lecture presented in Beijing, China (part 1)
Manichaeism has existed in Tibet since around 260 C.E. Adherents of the Religion of Light in Tibet strictly maintained Manichaean religious ideals all the while within a Buddhist context.
Over the years, Manichaeism began to appear, at least on the surface, like Vajrayana, Mahayana and Pure Land Buddhism throughout Tibet and China. The Religion of Light has had a profound effect on each of these Buddhist schools. At one time almost all of Tibet was practicing Manichaeism.