Umberto II of Italy
In 1890 the structure was converted to an hotel that entertained national and international personalities, among others: Umberto II of Italy, Massimo d'Azeglio, Luigi Pirandello, Armando Diaz (who sojourned in Rocca di Papa and was remembered with a commemorative headstone mail in the residence on De Rossi palace) and the King Edward VIII with his wife Wallis Simpson.