Date of Birth: 
About Rosario Cooper
- Rosario Cooper (1845–1917) was a yak tit?u tit?u yak tilhini woman (Northern Chumash).
- Cooper was the last known speaker of tilhini (formerly known as Obispeño), 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 tilhini, though there has been some recent revitalization.
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