Dukes | Titles by Rank
- Counts-Dukes of Olivares
- Ducas di Lavello
- Duchi di Crosia
- Dukes Borea d' Olmo
- Dukes Decazes
- Dukes dell' Abbadessa
- Dukes dell' Anguillara
- Dukes dell' Asinara
- Dukes della Grazia
- Dukes delle Pesche
- Dukes Dusmet de Smours
- Dukes Grazioli
- Dukes Imperiali
- Dukes Imperiali di Francavilla
- Dukes in Bavaria
- Dukes Lante della Rovere
- Dukes Lanza Branciforte
- Dukes of Abercorn
- Dukes of Abrantes
- Dukes of Abrantès
- Dukes of Abrantes-e
- Dukes of Accadia
- Dukes of Acerenza
- Dukes of Acquasparta
- Dukes of Addis Ababa
- Dukes of Adragna
- Dukes of Aguiar
- Dukes of Ahumada
- Dukes of Aiguillon
- Dukes of Airola
- Dukes of Alagón
- Dukes of Alba
- Dukes of Albany
- Dukes of Albemarle
- Dukes of Albermale-I
- Dukes of Albermale-II
- Dukes of Albermale-III
- Dukes of Albret
- Dukes of Albufera
- Dukes of Albuquerque
- Dukes of Alburquerque
- Dukes of Alcalá de los Gazules
- Dukes of Alemania
- Dukes of Alençon
- Dukes of Alessano
- Dukes of Algeciras
- Dukes of Algete
- Dukes of Aliaga
- Dukes of Almazán
- Dukes of Almazán de Saint Priest