Piedmont, a district of Italy, formerly a principality, ruled by the house of Savoy, surrounded by the Alps, the Apennines, and the river Ticino; occupies the W. end of the great fertile valley of the Po, a hilly region rich in vines and mulberries, and a mountainous tract with forests and grazing land intersected by lovely valleys, which send streams down into the Po; the people are industrious; textile manufactures are extensive, and agriculture is skilful; Turin, the largest town, was the capital of Italy 1859-1865; in the glens of the Cottian Alps the Vaudois or Waldenses, after much persecution, still dwell.