Piedmont has always been known for producing great red wines, especially those made from Nebbiolo, the region's main grape variety. It became renowned in the 19th century thanks to the Marquises of Barolo, who, after the intervention of French oenologist Louis Oudart, commissioned by the Marchioness, quickly realized that it was possible to produce dry wines, not the sweet ones produced for shipping. Thus was born Barolo, and thanks to Camillo Benso, Count of Cavour, who converted his winery to produce Barolo, it became famous nationally and internationally. Piedmont was the first region to create parcels, subdivisions of vineyard plots named after municipalities and also listed on labels, similar to the French Crus. Today, there are 17 DOCG zones and 41 DOC zones, including both red and white wines. Barbera, the most widely grown grape in Piedmont, and Moscato d'Asti, a sparkling wine distributed worldwide, are obligatory.