Historic records show that Calon Segur was in existence as far back as 1147, when it was owned by Monseigneur de Calon. He was an important Bishop in the community. This makes Chateau Calon Segur a contender for the oldest property in Saint Estephe. Eventually the Medoc property came to be owned by Nicolas Alexandre de Segur. Which as you can see is where the name Calon Segur comes from.