The Umbrian language reference article from the English Wikipedia on 24-Jul-2004
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Umbrian language

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Umbrian, an Indo-European language of the Italic family, is a dead language formerly spoken in Umbria, Italy.

It is known primarily from the Tabulæ Iguvinæ (Iguvium = modern Gubbio), seven bronze plates which contain some notes on the ceremonies and statutess for priests.

Currently, the term is used to indicate a regional dialect of the Italian language.