Castello Banfi is the flagship estate of Banfi Vintners, which is owned and operated by the Mariani family of New York. The privately-held Banfi Vintners was founded by John Mariani Sr. in New York in 1919 when he started importing European wines to the U.S. Today Banfi Vintners is run by his grandchildren and the enterprise includes a large portfolio of wine estates in Europe and elsewhere. Castello Banfi owns 7,000 acres, 2,000 of which are planted to grape vines. The estate also grows olives, wheat, truffles and plums. Castello Banfi makes many wines, but is known especially for its Brunello di Montalcino and Sangiovese. It also makes several Super Tuscans including its Summus and Excelsus Cabernet Sauvignon blends.