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:''For the preceding treaty, see Treaty of Kėdainiai'' Union of Kėdainiai (or Agreement of Kėdainiai, Polish: ''Umowa Kiejdańska'') was an agreement between several magnates of the Grand Duchy of Lithuania and the king of the Swedish Empire, Charles X Gustav. It was signed on 20 October 1655 during the "Swedish Deluge", part of the Second Northern War.〔Frost (2000), p. 168〕 In contrast to the preceding Treaty of Kėdainiai of 17 August, which put Lithuania under Swedish protection,〔 the purpose of the Swedish-Lithuanian union was to end Lithuania's union with Poland, and set up two separate principalities in the Grand Duchy of Lithuania. One of these was to be ruled by the Radziwiłł (''Radvila'') family, while the rest of the duchy was to remain a Swedish protectorate. The agreement did not last for long and never came into effect, as the Swedish defeat in the Battles of Warka and Prostki as well as a popular uprising in both Poland and Lithuania put an end both to Swedish power and the influence of the Radziwiłłs. ==History== The Radziwiłł family owned vast areas of land in Lithuania and Poland and some of its members were dissatisfied with the role of the magnates, who in the Polish–Lithuanian political system theoretically had the same rights as the Polish nobility. Eventually, the interests of the wealthy clan, known as the "Family", and the Crown began to drift apart. In 1654, during the Swedish and Russian invasion of Poland, known as The Deluge, two notable princes of the Radziwiłł clan, Janusz and Bogusław, began negotiations with the Swedish king Charles X Gustav, aimed at dissolving the Commonwealth and the Polish–Lithuanian Union. At the time Lithuania was in turmoil: it was being attacked on two separate fronts by Russia and Sweden, while the Ukrainian peasant revolt known as the Khmelnytsky Uprising was spilling into the Grand Duchy's southern regions from Ukraine. Eventually, most of the Polish-controlled Lithuanian army capitulated to the Swedes and the state collapsed. Most of the Crown of Poland along with western parts of Lithuania were occupied by Swedish forces, while the Russians seized most of Lithuania (except Samogitia and parts of Suvalkija and Aukštaitija). On 17 August, Janusz Radziwiłł signed the Treaty of Kėdainiai, placing the Grand Duchy under Swedish protection.〔 On 10 October 1655 (O.S.), Janusz and Bogusław Radziwiłł signed an agreement with the Swedes at their castle at Kėdainiai. According to the treaty, signed by the two cousins in the name of all Lithuanian nobility, the Polish–Lithuanian Union was declared null and void. In exchange for military assistance against Russia, the Grand Duchy of Lithuania was to become a protectorate of Sweden, with a personal union joining two states. In addition, ''The Family'' was to be given two sovereign principalities carved from their lands within the Grand Duchy and the Lithuanian nobility was to retain its liberties and privileges. The agreement never came into force. Its main proponent, Janusz Radziwiłł, died only 2 months after it was signed, on December 31 at Tykocin Castle, which was then besieged by forces loyal to the King of Poland and the Grand Duke of Lithuania John II Casimir. The castle was taken soon after by Paweł Jan Sapieha, who immediately succeeded Janusz Radziwiłł to the office of Grand Hetman of Lithuania. The tide of the war soon turned and a popular uprising in Poland broke the power of the Swedish army. The Swedish occupation of Lithuania sparked a similar uprising in Lithuania. The Swedish defeat and eventual retreat from the territories of the Commonwealth abruptly ended the plans of Janusz's cousin Bogusław, who lost his army in the Battle of Prostki and died in exile in Königsberg on December 31, 1669. With the passing of the two cousins, the Radziwiłł family fortunes waned. Bogusław became commonly known as ''Gnida'' (The 'Louse') by his fellow nobles while Janusz was termed ''Zdrajca'' (the 'Traitor'). Their treason against the Commonwealth largely overshadowed the deeds of numerous other family members of the next generation, including Michał Kazimierz Radziwiłł (1625–1680), who served faithfully against the Swedes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Union of Kėdainiai」の詳細全文を読む スポンサード リンク
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