Oscan is known from inscriptions dating as far back as the 5th century BCE.
From the en.wikipedia.org
Oscan had much in common with Latin, though there are also many striking differences, and many common word-groups in Latin were absent or represented by entirely different forms.
From the en.wikipedia.org
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An Oscan-speaking member of an ancient people of Campania
An extinct Italic language of ancient southern Italy
Oscan according to SIL International standards has two definitions. As the "Osco-" member of the Osco-Umbrian group, it has itself been expanded into a group, Oscan, whether of dialects or of languages. One member of the Oscan group is Oscan, the language of southern Italy under the Roman Republic.
The Osci (also called Opici, Opsci, Obsci, Opicans, Ancientu00A0Greek: u038Cu03C0u03B9u03BAu03BFu03AF, u038Cu03C3u03BAu03BFu03AF), were an Italic people of Campania and Latium adiectum during Roman times. They spoke the Oscan language, also spoken by the Samnites of Southern Italy. Although the language of the Samnites was called Oscan, the Samnites were never called Osci, or the Osci Samnites.