Wintun is the name generally given to a group of related Native American tribes who live in Northern California, including the Wintu (northern), Nomlaki (central), and Patwin (southern) tribes. Their range is from approximately present-day Lake Shasta to San Francisco Bay, along the western side of the Sacramento River to the Coast Range. Each of these tribes speak one of the Wintuan languages. Linguistic and archaeological evidence suggests that the Wintun people probably entered the California area around 500 AD from what is now southern Oregon, introducing bow and arrow technology to the region (Golla 2011: 205).
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Whistler, Kenneth W. 1977. "Wintun Prehistory: An Interpretation based on Linguistic Reconstruction of Plant and Animal Nomenclature." Proceedings of the Third Annual Meeting of the Berkeley Linguistics Society, February 19–21. pp. 157–174. Berkeley.