Guru Dragpo, originating in the 'Revealed Treasure' Tradition of the Nyingma School of Tibetan Buddhism, is a wrathful meditational form of Padmasambhava. Although technically a guruyoga practice the function of Guru Dragpo is that of an ishtadevata (meditational deity). In the Nyingma Tradition, following after the early meditational deities of the Guhyagarbha Tantra and Eight Heruka this practice of Guru Dragpo is possibly the most popular and the most represented in art. In the 16th century the teacher Pema Karpo popularized a variation on Guru Dragpo called Guru Dragpur - principally practiced in the Drugpa Kagyu School.