The famous French aristocratic family exerted a decisive influence on wine growing in Bordeaux. The first in the long line was the notary Jacques de Ségur (+1691), a native of Pauillac, who held the position of councillor in the Parliament of Bordeaux. In 1670, his wife Jeanne de Gasq brought the seigneurie (manor house) Lafite as a dowry to the marriage, which then developed into the Premier Cru Classé vineyard Château Lafite-Rothschild. He subsequently expanded the vineyard holdings by planting new vines and purchasing additional vineyards until 1680. Among them was a plot called "Clos de Mouton", from which Château Mouton-Rothschild emerged. His son Alexandre de Ségur (1674-1716) married Marie-Thérèse de Clausel in 1695, who brought the Premier Cru Classé vineyard Château Latour, the entire southern part of Pauillac and another vineyard as a dowry.