Château Pichon-Longueville Baron is a Deuxième Cru Classé estate in the commune of Pauillac.  Originally part of a single estate known as Pichon with Pichon-Lalande, Pichon-Baron became a separate estate when, in 1850, in a Lear-like move, Baron Joseph de Pichon Longueville divided the estate between his five children on his death bed.  His sons received the Pichon-Baron lands and his daughters received what became Pichon-Lalande.  

Pichon Baron continued in the ownership of the Pichon-Longueville family until 1933.  The estate was in decline through the 1960s and 70s until it was acquired by AXA insurance, who installed Jean-Michel Cazes to improve quality.  Cazes was succeeded by Christian Seely in 2000, ushering in a new phase of far more successful vintages.

The 73 hectare vineyard is split into 4 plots and further subdivided into many small parcels, planted to 65% Cabernet Sauvignon, 30% Merlot, 3% Cabernet Franc and 2% Petit Verdot.