Longchenpa and Rangjung Dorje shared a particularly close relationship since they both counted Rigdzin Kumaradza as one of their root teachers and studied together. The Third Karmapa is responsible for introducing Dzogchen vocabulary into the Mahamudra tradition and bringing these two traditions closer together.
It is said that during a retreat in his early twenties he had a vision at sunrise of Vimalamitra and then Padmasambhava, who dissolved into him at a point between his eyebrows. At that moment, he realized and received all the teachings and transmissions of the Dzogchen tantras. He wrote many volumes of teachings on Dzogchen and founded the Karma Nyingtik lineage.
Today, 4 August, is his anniversary.