Château d'Yquem (French: [ʃɑto d ikɛm]) is a Premier Cru Supérieur (Fr: "Superior First Growth") wine from the Sauternes, Gironde region in the southern part of the Bordeaux vineyards known as Graves. In the Bordeaux Wine Official Classification of 1855, Château d'Yquem was the only Sauternes given this rating, indicating its perceived superiority and higher prices over all other wines of its type. Yquem's success stems largely from the site's susceptibility to attack by "noble rot" (Botrytis cinerea).