Andalusia is a region in modern-day southern Spain which once included the "lost" city of Tartessos, which disappeared in the 6th century BC. The Tartessians were traders known to the Ancient Greeks who knew of their legendary king Arganthonios. The Andalusian hypothesis was originally developed by the Spanish author Juan de Mariana and the Dutch author Johannes van Gorp (Johannes Goropius Becanus), both of the 16th century, later by José Pellicer de Ossau Salas y Tovar in 1673, who suggested that the metropolis of Atlantis was between the islands Mayor and Menor, located almost in the center of the Doñana Marshes, and expanded upon by Juan Fernández Amador y de los Ríos in 1919, who suggested that the metropolis of Atlantis was located precisely where today are the 'Marismas de Hinojo'. These claims were made again in 1922 by the German author Adolf Schulten, and further propagated by Otto Jessen, Richard Hennig, Victor Berard, and Elena Wishaw in the 1920s. The suggested locations in Andalusia lie outside the Pillars of Hercules, and therefore beyond but close to the Mediterranean itself.