For several generations, the seigneurie of Cazebonne — and the plots that today make up the Château Cazebonne vineyard — remained in the hands of the de Castelnau family, a family of the Langon noblesse de robe, whose members served successively as Mayor of Langon, in the Parlement de Bordeaux, and in the royal regiments.

The branch in question traces back to Joannés de Castelnau, married to Catherine Ducasse, whose descendants spread throughout the Bordeaux region in the 16th and 17th centuries. Two brothers established the lineage that would later be associated with Cazebonne: Pierre de Castelnau (married in 1581 to Marguerite Pailhey) and Jean de Castelnau (married in 1563 to Jeanne de Lobis).

Descendants of the first branch notably include:

• Pierre de Castelnau (c. 1642–1702), advocate at the Parlement de Bordeaux and perpetual mayor of Langon, married in 1669 to Jeanne de Lagrange;

• his son Pierre de Castelnau (1676–1740), who resided at the maison de Cazebonne — where he passed away, as recounted in the obituary of Pierre de Castelnau by his son (1740);

• François de Castelnau dit “Cazebonne” (1706–1766), the eldest, advocate at the Parlement de Bordeaux and King’s counsellor, married in 1754 to Marie-Thérèse d'Arche: he was the one who officially took the name of the estate.

The lineage then continued with François de Castelnau (1673–1727), followed by Bernard de Castelnau († 1774), Mathieu de Castelnau (1763–1804), and extended into the 19th century with Marie-Jeanne de Castelnau (1791–1874), married in 1812 to Pierre-Michel de Baritault.

Descendants of Joannés de Castelnau — family tree compiled by Loïc Mansencal (Geneanet). Download the PDF.

Sale to the Martinet family in the mid-19th century

In the mid-19th century, Cazebonne left the de Castelnau family: the estate was sold to Jacques Martinet (1866–1924), originally from Sainte-Bazeille in the Lot-et-Garonne. The Martinet family retained Cazebonne at least until the interwar period, continuing winegrowing on the plots inherited from the Castelnau era, before the estate faced the trials of phylloxera, the wine crises of the early 20th century, and the upheavals of both World Wars.

The estate was subsequently taken over by the Bridet family, who managed the property until 2016, when it was acquired by Jean-Baptiste Duquesne.

It is this long thread — from the 17th-century Langon noblesse de robe to the 19th-century bourgeois owners — that Château Cazebonne continues today, replanting on these very plots the historic Bordeaux grape varieties that had disappeared.