or AOST, a town of Italy, in Piedmont, and capital of the duchy of the same name, a bishop's see, and subject to the king of Sardinia. It is remarkable for several monuments of the Romans, and for the birth of Anselm archbishop of Canterbury. It is seated at the foot of the Alps, on the river Doria. E. Long. 7. 33. N. Lat. 45. 58.

territory of Piedmont, with the title of a duchy. It is a valley 30 miles in length, and extends from the pass of St Martin's, near the frontiers of Yvrece, to St Bernard. It abounds in pastures, and all sorts of fruits. The capital is of the same name.