The Jokhang, (Tibetan: ཇོ་ཁང་; Wylie: Jo-khang; also called the Jokang, Jokhang Temple, Jokhang Monastery or Tsuklakang (gTsug lag khang), is located on Barkhor Square in Lhasa. It was built during the reign of king Songsten Gampo (605?-650 CE) to celebrate his marriage with Chinese Tang Dynasty princess Wencheng, who was a Buddhist.
During the Bon period of Tibet the temple was (and sometimes still is), called the 'Tsuklakang' (Tsulag Khang) — 'House of Religious Science' or 'House of Wisdom.' The term tsuklak refers to the 'sciences' such as geomancy, astrology, and divination which formed part of the pre-Buddhist shamanistic religion now referred to as Bon. It is more commonly known today as the Jokhang, which means the 'House of the Buddha'.
For most Tibetans it is the most sacred and important temple in Tibet. It is in some regards pan-sectarian, but is presently controlled by the Gelug school.
Along with the Potala Palace, it is probably the most popular tourist attraction in Lhasa. It is part of the UNESCO World Heritage Site "Historic Ensemble of the Potala Palace," and a spiritual centre of Lhasa.
en.wikipedia.org/wiki/Jokhang 