The Dukes of Castel Duino are a noble family in Italy descending from the Bohemian line of the Princely House of Thurn and Taxis.
The title was created along with the additional title of Principe della Torre e Tasso in 1934 for Prince Alexander of Thurn and Taxis following his naturalisation in the Kingdom of Italy.
The second duke, Raimondo, married Princess Eugénie of Greece and Denmark a member of the Greek Royal Family.
[1] The seat of the family is Duino Castle in Duino in the Province of Trieste, Friuli-Venezia Giulia.
The heir is Prince Dimitri della Torre e Tasso (born 1977).