What is "haut-brion"

Haut-Brion is a name found in several Bordeaux wine producers in the Graves district, including:

• Château Haut-Brion, a premier cru selection of the 1855 classification then named simply Haut-Brion
• Château Laville Haut-Brion, a grand cru of the Graves classification
• Château La Mission Haut-Brion, a grand cru of the Graves classification
• Château La Tour Haut-Brion, formerly a grand cru, now discontinued
• Château Les Carmes Haut-Brion, an unclassed Pessac-Léognan estate
• Château Larrivet-Haut-Brion, an unclassed Pessac-Léognan estate