Realm of Shambhala
According to tradition, the root text of the Kalachakra Tantra was first revealed by the Buddha Shakyamuni as the magical manifestation of the Kalachakra deity to King Suchandra of Shambhala who traveled to India in order to request and receive this tantra.
At the glorious Drepung stupa in South India, a year after his complete enlightenment, it is said that the Buddha displayed the Wondrous Lunar Mansion Mandala, performed the Kalachakra empowerment and taught the tantra to King Suchandra and countless other human and non-human beings.
Upon returning to the realm of Shambhala, King Suchandra began teaching and transmitting the Kalachakra Root Tantra. This tantra has then been passed down successively to the present 21st Kalkin of Shambhala.
King Yashas, an emanation of Manjushri then composed the Condensed Kalachakra Tantra while his son, Kalkin Pundarika composed the primary commentary on the Condensed Kalachakra Tantra titled, Vimalaprabha or Stainless Light.
Then, as the legend is told, one day in the 10th century while walking along a path in northern India, the master Jamyang Dorje had a vision of his meditation deity Manjushri who instructed him to follow the path northwards.