The Shan live primarily in the Shan State of Burma, but also inhabit parts of Mandalay Division, Kachin State, and Kayin State, and in adjacent regions of China and Thailand. The Tai-Shan people are believed to have migrated from Yunnan in China. The Shan are descendants of the oldest branch of the Tai-Shan, known as Tai Long (Great Tai) or Thai Yai (Big Thai). The Tai-Shan who migrated to the south and now inhabit modern-day Laos and Thailand are known as Tai Noi (Little Tai). The Shan have inhabited the Shan Plateau and other parts of modern-day Myanmar as far back as the 10th century CE. The Shan kingdom of Mong Mao (Muang Mao) became a Burmese vassal state during the reign of King Anawrahta of Pagan (1044-77).