Most Vietnamese are Buddhists. The Vietnamese practice two forms of Buddhism: Mayahana or Great Vehicle Buddhism, and Theravada. Buddhism reached Vietnam through contacts with the Kushana Empire of India in the 2nd and 3rd centuries. Vietnam Buddhism has been harmoniously blended with the masses and has been flourishing on native living nutriment, and is pervaded with Vietnamese culture. The most widespread popular belief among the Vietnamese is the belief in ancestor-worship.