duchy · Scandinavia and the Baltic

Duchy of Finland

1556 CE – 1563 CE · capital Turku

Short-lived Finnish duchy granted to the future John III of Sweden, whose independent policy led his brother Eric XIV to crush it in 1563.

Origins

In 1556 Gustav Vasa granted his second son John the Duchy of Finland, covering south-western Finland, as an appanage. John set up his court at Turku Castle, which he enlarged in Renaissance style, and governed with considerable independence.

Rule and society

Duke John ran his own administration, collected taxes and pursued a foreign policy of his own, which brought him into conflict with his half-brother, King Eric XIV. In 1562 he married Catherine Jagiellon, sister of King Sigismund II Augustus of Poland, and lent money to Poland while Sweden and Poland competed for Livonia.

Decline and legacy

Eric XIV regarded this as treason. In 1563 his army besieged and took Turku Castle, and John and Catherine were imprisoned at Gripsholm. The duchy was abolished, and Finland returned to direct rule by the Kingdom of Sweden. John deposed Eric in 1568 and reigned as John III.

Connections (1)

More states of Scandinavia and the Baltic →

Cite this page
APA
The Epoch Institute. (2026). Duchy of Finland. In The Epoch Institute States Register. https://the-epoch-institute.org/state/duchy-of-finland
MLA
“Duchy of Finland.” The Epoch Institute States Register, The Epoch Institute, 2026, https://the-epoch-institute.org/state/duchy-of-finland. Accessed .
Chicago
The Epoch Institute. “Duchy of Finland.” The Epoch Institute States Register. 2026. https://the-epoch-institute.org/state/duchy-of-finland.
Harvard
The Epoch Institute (2026) ‘Duchy of Finland’, The Epoch Institute States Register. Available at: https://the-epoch-institute.org/state/duchy-of-finland (Accessed: ).

Last reviewed October 2026Random state ↻