The French oenologist and former winery owner Bruno Prats shaped a new quality standard through his activities. In 1970 he inherited it with two brothers Château Cos d'Estournel
in Saint-Estèphe and headed it until 1998. During this time he achieved an enormous improvement in quality through meticulous and uncompromising measures and methods. In the Bordeaux Classification
In 1855, the château was classified second (Deuxième Cru Classé). Prats wine was called "Super-Second". This means that due to its high quality, it would actually earn first place (Premier Cru Classé). His son Jean Guillaume has followed in his footsteps and is now his father's successor. Bruno Prats always attached great importance to the unmistakable origin and the associated philosophy of the unity of soil, climate and grape varieties. For the term terroir
he created a memorable definition. Since the sale of his winery, he has worked worldwide as a consultant or in joint ventures, including in Portugal at the port wine house Symington
, as well as in Chile and South Africa.