Both resorts came to be frequented by members of European aristocratic families with famous names: Bismarck, Rothschild, Thurn und Taxis, Metternich, de Mora y Aragon, de Salamanca or Thyssen-Bornemisza. This transformed Marbella into a destination for the international jet set. Trading on Prince Alfonso's kinship to the royal courts of Europe, his hotel quickly proved popular with vacationing members of Europe's social elites, for its casual but discreet luxury. Jaime de Mora y Aragón, a Spanish "" and brother to Fabiola, Queen of the Belgians, as well as Adnan Khashoggi, were frequent visitors. Prince Alfonso's first marriage was to Princess Ira von Fürstenberg, an Agnelli heiress. Princess Marie-Louise of Prussia (great-granddaughter of Kaiser Wilhelm II) and her husband Count Rudolf "Rudi" von Schönburg–Glauchau eventually worked closely with the new proprietors, the Shamoon family, who took over the Marbella Club Hotel from Prince Alfonso.