versions of the myth state that the Indian philosopher Nagarjuna magically flew to the city of the nagas and retrieved the hidden sutras. Other myths deal with Buddhas in other worlds which can be reached through dreams or meditative visions such as Maitreya or Amitabha and who reveal new texts and teachings such as the five treatises of Maitreya. Later Mahayana Buddhists also wrote their own biographies of the Buddha which included Mahayana elements, such as the biography in the Tibetan Bu-ston's (1290–1364) Chos ’byung (“History of Buddhism”). Similarly, the promoters of the Theravādin Abhidhamma claimed that Abhidhamma had been taught by the Buddha to his mother in Tusita heaven. Other myths follow inanimate objects such as Buddhist relics. For example, the Pali text called the Bodhivamsa describes the bringing of a cutting from the Bodhi tree to Sri Lanka, while the Thūpavaṃsa tells the story of the Mahathupa ('Great Stupa') at Anuradhapura. Likewise, with the development of Tantric Buddhism and their new texts called Tantras, they also developed legends which sought to legitimate these texts as Buddhavacana (word of the Buddha) despite the fact that historically they could not have been taught during the time of Gautama Buddha. One of most prominent of these is the various legends surrounding a figure known as king Indrabhuti. In one version of the myth translated by Ronald M. Davidson, it states that during the Buddha's time, nobody was ready for tantra on earth, so it was taught in Tusita heaven. Afterwards, Vajrapani brought the tantric teachings to the country of Zahor to King Indrabhuti, who was instructed in their meaning by a teacher called Kukuraja. Such mythologies developed, not just as “official” sectarian doctrines, but as local tales. For example, in most Buddhist countries there is a story of how the historical Buddha visited their country and foretold that the Dharma would be established there. Mahāyāna mythology In addition to the Mahāyāna origin story, Mahāyanist texts include a wide variety of narratives and mythologies, with numerous divine figures and stories that do not appear in the earlier texts. These vary from dramatic or humorous tales, to abstract philosophical parables. Mahayana sutras such as the Lotus sutra and the Avatamsaka Sutra contain popular stories and parables which have been widely influential in Mahayana Buddhism. A central figure in Mahāyāna myths is the Bodhisattva, a spiritually advanced being who is on the path to