Their oral history says that the Bidai were the original peoples in their region. Their central settlements were along Bedias Creek, but their territory ranged from the Brazos River to the Neches River. The first written record of the tribe was in 1691, by Spanish explorers who said they lived near the Hasinai. French explorer François Simars de Bellisle described them as agriculturalists in 1718 and 1720.
They had three distinct villages or bands in the 18th century. The Deadose were the northernmost band of Bidai, who broke off in the early 18th century. The 18th century population of Bidai is estimated to be 600, while 200 additional Deadoses.
The Bidai suffered several epidemics during 1776-77, reducing their population by at least half. The survivors joined neighboring tribes, such as the Akokisas and Koasati. Some settled on the Brazos Indian Reservation in present day Young County, Texas and were removed with the Caddo to Indian Territory. Those that remained formed a village twelve miles from Montgomery, Texas, growing corn and picking cotton for hire in the mid-19th century.
Andre Sjoberg published an ethnohistory of the Bidai in 1951.
The Bidai hunted, gathered, fished, grew maize, and bartered their surplus maize. They snared game and trapped them in cane pens. In summers they lived along the coasts, but in winters they moved inland, when they lived in bearskin tents.
Before contact, the Bidai made their own ceramics, but quickly adopted metal utensils from European trade. They still made ceramic pots into the 19th century, and they also wove a variety of baskets. In 1803, Henry Hopkins Sibley wrote that Bidai had "an excellent character for honesty and punctuality."
Bidai medicine men were herbalists and performed sweatbathing. Patients could be treated by being raised scaffolds over smudge fires. While other Atakapan bands are known for their ritual cannibalism, the practice was never recorded among the Bidai.
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- Namah: one
- Nahone: two
- Naheestah: three
- Nashirimah: four
- Nahot nahonde: five
- Nashees nahonde: six
- Púskus: boy
- Tándshai: corn
Bidai has been spelled Biday, Bedies, Bidaises, Beadweyes, Bedies, Bedees, Bidias, Bedais, Midays, Vidais, Vidaes, Vidays. Their name could be Caddo, meaning "brushwood." Their autonym was Quasmigdo.
- Sturtevant, William C., general editor and Raymond D. Fogelson, volume editor. Handbook of North American Indians: Southeast. Volume 14. Washington DC: Smithsonian Institution, 2004. ISBN 0-16-072300-0.