The Vajrayoginī practice belongs to the highest (Annutarayogatantra) class of Vajrayana Practices. It has it's origin in the Chakrasamvara Tantra. The most widely spread Vajrayoginī tradition originates with the Mahāsiddha Nāropa. 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 brought the tantra to Tibet where it was quickly adopted as one of the main practices of the Sakya tradition. The Nāropa Vajrayoginī lineages of other schools generally are branches of this original lineage.