sentences:  The name "Triei" appears for the first time in a 1316 document, when it was part of the Giudicato of Cagliari.Later it was part of the Giudicato of Gallura, and then was under Pisa, the Aragonese (1323), Spain (1479), Austria (1708) and Piedmont (1720).In the Osono plateau existed once the village of Osono, known in 1217.