The myth of ethnic origin shows that these
North Bahnaric groups are close to the
Hmong–Mien inhabitants and some
Sino–Tibetan groups, suggesting that their ancestors may too have been from the far north. The closeness of their language and culture to the ancient
Vietic people's ones provides more evidence. It is possible that the
Chams ancestors separated them from the Vietic ancestors, then the internal conflicts of the
Mon–Khmer residents, the conflicts with the Cham people,
Lao people,
Siamese people from 12th century to 19th century, has narrowed their range of residence. Nowadays, they no longer remember the stories of the long migrations and they have attached their legends to some locations in northern
Central Highlands. Elite warriors, war horses, war elephants and logistics from Sedang tribes alongside Bahnar, Jarai and
H're tribes kept an important role in the victories of
Tây Sơn dynasty at the end of the 18th century. People used to consider the Sedang was one of the most combative races in the Central Highlands. During the French colonial period, Sedang were famous for their stubbornness, it took the French several years of hardship to conquer them. In 1888,
Marie-Charles David de Mayréna, a French adventurer - under the sponsor of the French government and the Kontum missionary association - persuaded some tribal chiefs of Sedang to form the Kingdom of Sedang with Mayréna as the King (self-proclaimed). After a failed fundraising campaign, the king was deposed by the French colonial authorities in 1889. The kingdom also ended with Mayréna's death in 1890. ==Economic Activities==