Finland under Swedish rule in the context of "First Swedish Crusade"

The House of Wittelsbach (German: Haus Wittelsbach) is a former Bavarian dynasty, with branches that have ruled over territories including the Electorate of Bavaria, the Electoral Palatinate, the Electorate of Cologne, Holland, Zeeland, Sweden (with Swedish-ruled Finland), Denmark, Norway, Hungary, Bohemia, and Greece. Their ancestral lands of Bavaria and the Palatinate were prince-electorates, and the family had three of its members elected emperors and kings of the Holy Roman Empire. They ruled over the Kingdom of Bavaria which was created in 1805 and continued to exist until 1918.

The House of Windsor, the reigning royal house of the British monarchy, are descendants of Sophia of Hanover (1630–1714), a Wittelsbach Princess of the Palatinate by birth and Electress of Hanover by marriage, who had inherited the succession rights of the House of Stuart and passed them on to the House of Hanover.

Vyborg (/ˈviːbɔːrɡ, ˈviːbərk/; Russian: Выборг, IPA: [ˈvɨbərk]; Finnish: Viipuri, IPA: [ˈʋiːpuri]; Swedish: Viborg, IPA: [ˈvǐːbɔrj] ) is a town and the administrative center of Vyborgsky District in Leningrad Oblast, Russia. It lies on the Karelian Isthmus near the head of Vyborg Bay, 130 km (81 miles) northwest of St. Petersburg, 245 km (152 miles) east of the Finnish capital Helsinki, and 38 km (24 miles) south of Russia's border with Finland, where the Saimaa Canal enters the Gulf of Finland. The most recent census population of Vyborg is 72,530 (2021 census).

Vyborg was founded as a medieval fortress in Finland under Swedish rule during the Third Swedish Crusade. After numerous wars between the Russians and Swedes, the Treaty of Nöteborg in 1323 defined the border of eastern Finland, and would separate the two cultures. Vyborg remained under Swedish rule until it was captured by the Russians during the Great Northern War. Under Russian rule, Vyborg was the seat of Vyborg Governorate until it was incorporated into the newly established Grand Duchy of Finland, an autonomous part of the Russian Empire. Finland declared its independence from Russia in 1917, after which Vyborg became its second-most significant city after Helsinki, and represented internationally as its most multicultural city. During World War II, Vyborg's population was evacuated and the town was ceded to the Soviet Union. In 2010, Vyborg was conferred the status of "City of Military Glory" by Russian president Dmitry Medvedev.

Birger Jarl or Birger Magnusson (c. 1210 – 21 October 1266) was a Swedish statesman and regent, jarl, and a member of the House of Bjälbo, who played a pivotal role in consolidating Sweden after the civil wars between the House of Erik and the House of Sverker. His first marriage was to Princess Ingeborg of Sweden, which created his base of power. Birger led the Second Swedish Crusade, which established Swedish rule in Finland. Additionally, he is traditionally attributed with the foundation of the Swedish capital, Stockholm, around 1250. Birger used the Latin title of dux sveorum et guttorum ("duke of Swedes and Geats").

The Royal Academy of Turku or the Royal Academy of Åbo was the first university in Finland, and the only Finnish university that was founded when the country still was a part of Sweden. It was founded in 1640. In 1809, after Finland became a grand duchy within the Russian Empire, it was renamed the Imperial Academy of Turku. In 1828, after the Great Fire of Turku, the institution was moved to Helsinki, in line with the relocation of the capital of the grand duchy. It was finally renamed the University of Helsinki when Finland declared independence in 1917.
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The governor-general of Finland was the military commander and the highest administrator of Finland sporadically under Swedish rule in the 17th and 18th centuries and continuously in the autonomous Grand Duchy of Finland between 1809 and 1917.

John III (Swedish: Johan III; 20 December 1537 – 17 November 1592) was King of Sweden from 1569 until his death. He attained the Swedish throne after a rebellion against his half-brother Erik XIV. He is mainly remembered for his attempts to close the gap between the newly established Lutheran Church of Sweden and the Catholic Church, as well as his conflict with and possible murder of his brother.

John was also, quite autonomously, the Duke of Finland from 1556 to 1563. In 1581 he assumed the title Grand Duke of Finland. His first wife was Catherine Jagiellon of the Polish–Lithuanian ruling family, and their son Sigismund eventually ascended both the Polish–Lithuanian and Swedish thrones. He ended the Northern Seven Years' War, but instead Sweden was drawn into the 25 Years' War with Russia, where minor gains were eventually made. He worked for closer relations with Poland. John III was interested in religion and culture. During his reign, he countered the growing Lutheran tendencies of the Church of Sweden under the influence of Duke Charles, and worked for a reunion with the Catholic Church and the Pope in Rome.

The Treaty of Värälä (sometimes known as the Treaty of Wereloe) was signed in Värälä, Elimäki Municipality, Finland, between Russia (represented by Otto Heinrich Igelström) and Sweden (represented by Gustaf Mauritz Armfelt). It was signed on 14 August 1790 and concluded the Russo-Swedish War. The treaty confirmed status quo ante bellum with respect to the borders; however, Russia's right to interfere with Swedish interior affairs from the Treaty of Nystad was expressly revoked. The provisions of the previous Treaty of Åbo were basically confirmed.

A year later, on 19 October 1791, a convention was signed in Stockholm, whereby the countries pledged to assist each other in case of foreign attack. The treaty anticipated the First Coalition in its being directed against Revolutionary France. Catherine bound herself to pay her new ally annual subsidies amounting to 300,000 rubles. Gustav III had sent to his cousin, Catherine II of Russia, a letter in which he besought her to "forget the war as a passing cloud" and invoked their common blood as his claim to enjoy amitie with his cousin.