Opus One was a joint venture between Robert Mondavi and the late Baron Philippe de Rothschild. The first vintage (1979) was released in 1983 at the then unprecedented price of fifty dollars a bottle. Opus One's fruit comes from the densely planted vineyards that surround the state of the art winery in the Oakville appellation. Opus One is a blend of 95% Cabernet Sauvignon and 5% Merlot and is aged for 18 months in French barrels (100% new) and then another 18 months in bottle before it is released. Without doubt Opus One is one of California's most high profile wines, as well as being one of its best.