The words "Château," "clos," "domaine," "cru," "moulin," and "tour" frequently appear on wine labels, yet few are aware that their use is governed by specific legal texts and jurisprudence dating back centuries. The first major development was the law of January 1, 1930, which amended Article 10 of the law of May 6, 1919, reserving terms such as "clos," "château," "domaine," "moulin," "tour," "côte," "cru," or "monopole" exclusively for wines with an appellation d'origine contrôlée (AOC). An AOC is a system that guarantees the wine's origin, quality, and production methods, ensuring it meets strict standards. A decree of September 30, 1949, further supplemented Article 13 of the decree of August 19, 1921, by adding the condition that the wine must come from an existing agricultural estate precisely named by these terms. This established a rule that a wine could only bear the names "château," "domaine," or equivalent terms if it had an AOC and originated from an estate with cultural autonomy, meaning its own vineyards, buildings, and necessary winemaking equipment allowing bottling on the estate. Wines assembled by merchants outside the estate were not permitted to use these terms. Subsequent jurisprudence softened this point. In a ruling of May 20, 2003, confirmed by the Court of Cassation on May 4, 2004, the Bordeaux Court of Appeal stated that no provision exempts from the cumulative conditions set by the law of the time for the loyal use of the term "château," namely a product benefiting from an appellation of origin and a product originating from an existing agricultural estate. The decision clarified that cultural autonomy requires the wine to be obtained exclusively from grapes harvested in the estate's vineyards and that the winemaking must be carried out there. Otherwise, the label could be nullified. European law now plays a significant role. Regulation (EU) 2019/33 has reserved the use of certain terms for wines with an AOP or IGP. These terms include, for France: "abbaye," "bastide," "campagne," "chapelle," "château," "clos," "commanderie," "cru," "domaine," "mas," "manoir," "monastère," "monopole," "moulin," "prieuré," and "tour." Three conditions accompany this reservation: the wine must be produced exclusively from grapes harvested in the vineyards of the entity concerned, the winemaking must be entirely carried out in the same estate, and the use of the term must be regulated by the relevant member state. The regulation also adds a protection: an operator who markets a product from an estate cannot use the estate's name on the label unless the estate has given its consent. French law further clarifies these terms through Decree No. 2012-655 of May 4, 2012. Article 6 defines a vitivinicultural estate as an entity consisting of vineyard parcels, specific buildings and equipment, and having a dedicated or identified vinification infrastructure within a cooperative winery. The text specifies that only wines listed in the estate's harvest and production declarations can use the estate's name. This definition incorporates the traditional requirement of cultural autonomy while allowing for the use of cooperative winery infrastructure, provided it is specifically identified. Thus, a cooperative winery can use the term "château" for wines produced on its members' vineyards. Article 7 of the same decree establishes the two lists that govern the subject today, and these lists are now limiting. The terms "château," "clos," "cru," and "hospices" are reserved exclusively for AOP/C wines produced from grapes harvested and vinified in an estate bearing these names. Under the same conditions of harvest and vinification on-site, AOP/C and IGP wines can use "abbaye," "bastide," "campagne," "chapelle," "commanderie," "domaine," "mas," "manoir," "monastère," "monopole," "moulin," "prieuré," and "tour." The term "clos" is subject to another legal framework. It can only be used if the parcels are physically enclosed by walls or hedges or if the appellation itself includes the word "clos" in its name. For example, a Burgundy wine with an appellation historically containing "clos" can continue to use the term even if the physical enclosure has disappeared over time. The term "cru" is particularly prone to confusion, as it encompasses distinct legal realities. First, under Article 7 of the 2012 decree, "cru" refers to an individual estate and requires a notoriety of at least ten years under that name. Second, classifications such as "grand cru" or "premier cru" are governed by Article 13, 3° of the decree of August 19, 1921, and depend entirely on the specific regulations of each appellation. These designations are unrelated to the ten-year notoriety requirement for "cru" as an estate name. The use of "château" does not require the presence of a real castle. Jurisprudence concerning Bordeaux and even Languedoc properties has accepted the term regardless of the existence of a seigneurial residence on the estate. The Court of Justice of the European Union has also affirmed that European regulation does not require the architectural presence of a château.