Leeuwin Estate is one of the founding wineries of the now famous Margaret River district. In 1972, following an extensive search for the area most suitable to produce the best varietal wines in Australia, legendary American winemaker, Robert Mondavi identified the future site of the Leeuwin vineyard. Originally a cattle farm, Leeuwin Estate evolved, under the direction of Denis and Tricia Horgan, with Robert Mondavi acting as consultant and mentor. A nursery was planted in 1974 and the vineyards were planted over a five year period from 1975. Careful study, and the eventual grafting of some vines has revealed the best varieties for the Leeuwin vineyard to be Chardonnay and Cabernet Sauvignon; Riesling, Sauvignon Blanc and Shiraz make up the diversity of the vineyard, which also incorporates smaller plantings of varieties utilised for blending. Featuring state-of-the art facilities, the winery building was opened in 1978, celebrating with a trial vintage and Leeuwin enjoyed its first commercial vintage in 1979. Leeuwin Estate releases its wines under three labels, the "Art Series", Prelude Vineyards and Siblings.