Noun
The territory of a duke.
The title or dignity of a duke.
Source: Webster's dictionaryHe signed himself prince of this, lord of that, baron of the other thing and claimant to the dukedom of something else. Murray Leinster
My library; Was dukedom large enough. William Shakespeare
Knowing I loved my books, he furnished me, From mine own library with volumes that; I prize above my dukedom. William Shakespeare
A Duke may belong to a peerage and hold a dukedom (title) but no duchy (territory). Source: Internet
Bismarck regarded it as a mockery of his ambition, and he considered nothing more cruel than this action of the emperor. citation Upon Bismarck's death in 1898 his dukedom, held only for his own lifetime, became extinct. Source: Internet
Burgundy became a part of the kingdom of the Franks in 534; two years later, the dukedom of the Alamans followed suit. Source: Internet