 Complete the following phrase:  Originally, a vineyard, the estate was owned by the Arnaud family since the end of the 18th century, and the name first appears in records from 1837. In the 1868 edition of Cocks  Féret, under listing Crus bourgeois et 1ers artisans, Pétrus was ranked behind Vieux Château Certan and alongside Château Trotanoy. Some vintages of this period were labelled Petrus-Arnaud. At the 