 It is the site of the Palace of the Marquis de Santa Cruz, built in the late sixteenth century by Álvaro de Bazán, 1st Marquess of Santa Cruz.Álvaro de Bazan was a senior admiral in the Spanish Navy, and created the concept of the Spanish Armadabut died before it was deployed to attack England.The Marquis's palace has been repurposed as the modern headquarters of the National Archive of the Spanish Navy.