Duchy of Estonia (1561–1721) in the context of "Erik XIV"

Estonia under Swedish rule signifies the period of time between 1561 and 1710, when present-day Estonia was under the rule of the Swedish Empire. In the wake of the breakup of the State of the Teutonic Order, the Baltic German local nobility in the areas of Harrien (Harjumaa) and Wierland (Virumaa), as well as the city of Reval (Tallinn) in June 1561 (and somewhat later Jerwen (Järvamaa)) asked for and were granted protection by the Swedish king Eric XIV, leading to Swedish involvement in the Livonian War. At the conclusion of hostilities in 1583, Sweden was in control of the northern parts of modern Estonia and Dagö (Hiiumaa island); the Duchy of Estonia was created from this territory. Following renewed wars between Poland and Sweden, the southern parts of present-day Estonia (then Livonia) were incorporated into Sweden by the Treaty of Altmark in 1629. Sweden also conquered the island of Ösel (Saaremaa) from Denmark, and were thus in control of all of present-day Estonia.

The time of Swedish rule came to an effective end in 1710, when all the Swedish Baltic provinces capitulated to Russian troops during the end-stages of the Great Northern War. Russian hegemony was formalized in 1721.

Erik XIV or Eric XIV (13 December 1533 – 26 February 1577) became King of Sweden following the death of his father, Gustav I, on 29 September 1560. During a 1568 rebellion against him, Erik was incarcerated by his half-brother John III. He was formally deposed by the Riksdag on 26 January 1569. Erik was also ruler of Estonia, after it placed itself under Swedish protection in 1561.

While Erik has been regarded as intelligent and artistically skilled, as well as politically ambitious, early in his reign he showed signs of mental instability, a condition that eventually led to insanity. Some scholars claim that his illness began early during his reign, while others believe that it first manifested with the Sture murders.

With the Capitulation of Estonia and Livonia in 1710 the Swedish dominions Estonia and Livonia were integrated into the Russian Empire following their conquest during the Great Northern War. The Livonian nobility and the city of Riga capitulated on 4 July (O.S.) / 15 July 1710 (N.S.), Pernau (Pärnu) in August, and the Estonian nobility and the city of Reval (Tallinn) on 29 September (O.S.) / 10 October (N.S.). Russia left the local institutions in place and confirmed the traditional privileges of the German nobles and burghers as was established in Privilegium Sigismundi Augusti, especially with respect to the Protestant faith. The land reform of the so-called reduction which had been introduced by the Swedish king Charles XI, and transformed many serfs to subjects of the Crown, was reversed.

The Swedish Empire formally accepted the capitulations in the Treaty of Nystad in 1721. The transfer of the Baltic provinces marked the end of Sweden's and the beginning of Russia's time as a great power. The Baltic provinces retained their special status until the late 19th century.