The Treaty of Åbo (1743)

The Treaty of Åbo (also known as the Treaty of Turku) was signed on August 7, 1743, in the Finnish city of Åbo (modern Turku). It marked the end of the Russo-Swedish War of 1741–1743, a conflict between Sweden and the Russian Empire.

Background

• After the Great Northern War (1700–1721), Sweden had already lost much of its former great-power status to Russia.
• In 1741, Sweden—seeking to recover lost prestige—declared war on Russia, encouraged by France and by hopes of reclaiming territories.
• The war, however, was poorly managed by Sweden, and Russia quickly gained the upper hand, occupying much of Finland.

Key Terms of the Treaty

• Territorial Losses:
  Sweden ceded parts of southeastern Finland to Russia, including areas around Kymi River, Lappeenranta, Hamina (Fredrikshamn), and Savonlinna (Nyslott).
  This shifted the border westward, bringing Russia closer to Helsinki.
• Russian Influence in Swedish Politics:
  The treaty included a clause that Adolf Frederick of Holstein-Gottorp (a candidate favored by Russia) would succeed to the Swedish throne. This secured Russian influence over Sweden’s monarchy.
• Status Quo in the Rest of Finland:
  While Russia occupied more Finnish territory during the war, the treaty returned central and western Finland to Swedish control.

Consequences

• For Sweden:
  • The treaty confirmed Sweden’s decline as a great power.
  • The loss of southeastern Finland further weakened its strategic position.
  • The imposed succession arrangement increased foreign interference in Swedish domestic politics.
• For Russia:
  • Strengthened its hold in the Baltic region and secured new Finnish territories.
  • Advanced the Russian frontier closer to central Finland and the Gulf of Finland.
  • Expanded influence over Sweden by shaping its royal succession.
• For Finland:
  • The Finnish population in ceded areas came under Russian rule.
  • This was part of a longer process of Finland being caught between Sweden and Russia until it eventually became an autonomous Grand Duchy of Russia in 1809.

The Treaty of Åbo ended Sweden’s failed war against Russia, cost it parts of southeastern Finland, and demonstrated Russia’s growing dominance in Northern Europe while confirming Sweden’s decline.

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