Sardinian is a Romance language with about 1.2 million speakers in Sardinia. There are four dialects of Sardinian: Logudorese (Logudorian), Campidanese (Campidanian), Gallurese (Gallurian) and Sassarese (Sassarian).
Sardinian is a descendant of the ancient form of Latin brought to Sardinia by the Romans in 238 BC. Between the 14th and 17th centuries, Catalan and Spanish were the languages of administration in Sardinia. In 1714 Italian became the official and literary language in Sardinia, and the Italian authorities looked down on the Sardinian language.
source
wikipedia.org,
omniglot.com &
ethnologue.com