Grana Padano is a hard, slow-ripened, semi-fat cheese made from cows' milk, produced in the Po River valley. It is one of the world's first hard cheeses, created nearly 900 years ago by monks near Milan. Sometimes aging up to two years. It is made in a similar way to the Parmigiano Reggiano of Emilia-Romagna but over a much wider area and with different regulations and controls. It weighs 24 to 40 kg per wheel.