In general, the lineage traditions are supported by different, independent Tibetan institutions. Each of these major schools was predominant in Tibet during different periods of Tibetan history, and each have geographical areas where they are more popular. There are also innumerable subschools and divisions within each of these four major schools, a tendency which is heightened by the individual nature of lineage transmission. Still, many unifying movements have informed Tibetan institutions over the centuries. In particular, in the Nineteenth Century, the Rime movement led by Jamgon Kongtrul the Great and the great Jamyang Khyentse, revitalized many Sakya, Nyingma and Kagyu institutions by promoting respect and knowledge by each of the other.
