Chateau du Tertre is an estate located in Margaux in Bordeaux, France. It was classified as a fifth growth in the 1855 Classification of the Medoc and Graves and its 52 hectares (128 acres) of vineyards have been unchanged ever since. Both the grand vin and second wines are made from a blend of predominantly Cabernet Sauvignon, alongside Merlot, Cabernet Franc and Petit Verdot. It is one of the oldest properties in Bordeaux, dating back more than 1000 years.