Gulielmus comes from a five acre vineyard in Taurasi, in the Sala district, where the soil is clay and the traditional guyot trellised vines have been planted, starting from 1992, with buds harvested from the old pre-phylloxera vineyards. The harvest is done by hand between mid-October and early November. After fermentation in steel, the wine ages for 18-24 months in barriques and again in the bottle for over two years prior to release.