The Nineteenth Century Rim (non-sectarian) movement played a major role in shaping modern Tibetan Buddhism. This book provides an overview of the movement, the major figures within it, its background context and why it has exerted such an enduring influence. The central figures in the Rim movement opposed the solidification and political rivalries of the various Buddhist lineages and schools while encouraging the study and practice of them all. The movement played an important role in reviving marginalised traditions and saving others on the point of extinction. The majority of Tibetan lamas teaching in the West, including His Holiness the Fourteenth Dalai Lama, have been influenced by the Rim movement, and a number of important present-day lineages are directly connected to it. An appreciation of this movement is therefore invaluable for understanding Tibetan Buddhism as it is currently practised.