The Great Perfection, also known as the Atiyoga or Dzogchen (rDzogs chen), is a tradition of esoteric Buddhism that upholds instantaneous enlightenment. The literature of the Great Perfection has been divided up into three groups or sections: The Mind Section (Sems sde), the Space Section (kLong sde), and the Upadesha Instruction Section (Man ngag sde). The Royal Tantra on the Brilliant Diffusion of Majestic Space is the King of the Space Section Tantras, and is here translated in full for the first time. The Space Section transmission is known as the Vajra Bridge (rDo rje zam pa). It is said that Vairochana, a famous translator who was active during the Eighth Century of the Common Era, received the texts and instructions for the Space Section from his teacher Sri Singha, and then passed them down to his student Mipham Gonpo. It is said that for five generations of this lineage every master achieved a rainbow body at the time of his passing away.