One of the mysteries of the English language finally explained.
The territory of a Grand Duke or Duchess, a Grand Duchy; the office or dignity of a Grand Duke or Duchess (also personified).
Mid 17th century; earliest use found in 2nd Earl of Monmouth (1596–1661), translator. From grand + dukedom, after Grand Duke.
grand-dukedom/ˌɡran(d) ˈdjuːkdəm//ˌɡran(d) ˈdʒuːkdəm/
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