The Vajrayoginī practice belongs to the highest (Annutarayogatantra) class of Vajrayana Practices. The Vajrayoginī Practice has it's origin in the Chakrasamvara Tantra. The most widely spread Vajrayoginī tradition originates with the Mahāsiddha Nāropa. It is interesting that Nāropa did not give the Vajrayoginī empowerment to his student Marpa (The origin of the Marpa Kagyü) but rather to two Brothers of Pharping who actually brought this tantra to Tibet where it was quickly adopted as one of the main practices of the Sakya tradition.