The joint venture between Mondavi and Baron Rothschild was announced in 1980, though plans for the winery had been developing between the two men since the early 1970s. The genesis of Opus One wine can be traced to 1970 at the Mauna Kea Beach Hotel on the Big Island of Hawaii where Robert Mondavi and Baron Philippe de Rothschild met for the very first time and began their collaboration to merge old world and new world wine styles into one grand opus. In 1989 a new winery was built just down the road, the first vintage from the new winery was from 1991 and was released in 1994. For a while it was the most expensive Californian wine costing 50 USD. The first vintage, 1979 was released in 1984 at the same time as the 1980 vintage. The creation of this winery venture in 1980 was big news in the wine industry de Rothschild's involvement added an air of respectability to the burgeoning Napa wine region. It is located across State Route 29 from the Robert Mondavi Winery. The winery was founded as a joint venture between Baron Philippe de Rothschild of ChГўteau Mouton Rothschild and Robert Mondavi to create a single Bordeaux style blend based upon Napa Valley Cabernet Sauvignon. The wine was called napamedoc until 1982 when it was named Opus One. Opus One Winery is a winery in Oakville, California, USA.

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