Rosario Cooper dating history

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Rosario Cooper (1845–1917) was a yak titʸu titʸu yak tiłhini (Northern Chumash) woman who was the last known speaker of tiłhini (also known as Obispeño Chumash), though she had rarely spoken or heard it since her early childhood. During the last years of her life, Rosario worked with the linguist J.P. Harrington to recover what she could recall of her native language, and the pair were able to document some grammatical structure, place names, songs, and cultural knowledge before she died in 1917. Cooper is considered to be the last known speaker of Obispeño, though there has been some recent revitalization.