Brunello di Montalcino, according to the current rules of production for Brunello di Montalcino DOCG which were issued on July 1st, 1980, must be made from 100% Sangiovese grapes, but this was not the case prior to that declaration. In fact, when Brunello was only a DOC designation (from 1966 to 1980) the rules allowed for up to 10% correction with must and wine produced in other regions. However, this possibility was later excluded in the DOCG rules, a decision that has been reconfirmed again recently. Chianti, Chianti Classico, and Nobile di Montepulciano all have guidelines that are much more elastic but are still capable of producing high quality wines while allowing winemakers more freedom. Comparing Brunello di Montalcino to another very important Italian wine, Barolo, made from 100% Nebbiolo grapes, we can say that the production area of Brunello di Montalcino is very limited and the characteristics of the Montalcino terroir are obviously completely different in terms of area, weather, microclimate, and terrain from that of the Piedmont area where Barolo is produced.