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Soběslav I, Duke of Bohemia

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Title: Soběslav I, Duke of Bohemia  
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Subject: Maria of Bohemia, Vladislaus II, Duke of Bohemia, Bolesław III Wrymouth, 1140 deaths, 1075 births
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Soběslav I, Duke of Bohemia

Soběslav I of Bohemia
Duke of Bohemia
Image of Duke Soběslav
Duke of Bohemia
Reign 12 April 1125 – 14 February 1140
Predecessor Vladislaus I
Successor Vladislaus II
Born c. 1075
Died 14 February 1140(1140-02-14) (aged 64–65)
Spouse Adelaide of Hungary
Issue Wenceslaus II
Udalrich II
Maria of Bohemia
Soběslav II
House Přemyslid dynasty
Father Vratislaus II
Mother Świętosława of Poland
Religion Roman Catholicism

Soběslav I (also "Sobeslaus"; c.1075 – 14 February 1140) was Duke of Bohemia from 1125 until his death. He was a member of the Přemyslid dynasty, the youngest son of Vratislaus II (d. 1092), the first Bohemian duke to also rule as king, with his third wife Świętosława of Poland.


Soběslav is first documented about 1107, when he and his elder brother Duke Bořivoj II of Bohemia were expelled by their Přemyslid relative Svatopluk of Olomouc and fled to the court of their maternal cousin Duke Bolesław III Wrymouth of Poland. After Svatopluk was assassinated during the Battle of Głogów in 1109, Bořivoj's attempts to regain the Bohemian throne failed, as in the following fratricidal war his younger brother Vladislaus I prevailed, backed by King Henry V of Germany. Later the brothers reconciled and Soběslav was vested with rule at Brno and Znojmo in Moravia from 1115 until 1123, when the tensions between the brothers rose again and Soběslav was once more expelled.

Nevertheless, as the last surviving son of Vratislaus II he succeeded to the ducal throne after Duke Vladislaus' death in 1125. From the beginning his rule was contested by Otto II of Olomouc, the younger brother of Svatopluk, who gained the support not only from Vladislaus' widow Richeza of Berg but also from King Lothair III of Germany. Soběslav therefore was an adversary of the German monarchy throughout his reign and began by using the divisiveness of the 1125 election of King Lothair against rival Duke Frederick II of Swabia to further Bohemian independence.

When Soběslav decided to remove Otto II from Olomouc, the despoiled prince recoursed to the German king. Lothair III declared that no one could succeed to the Bohemian throne without Imperial investiture and proceeded to invade on behalf of Otto II. This, however, was dangerous to the interests of the local nobility, and they rallied around Soběslav. On 18 February 1126, the German and Moravian troops under Lothair met with the Bohemian forces at the Battle of Chlumec, a frontier fortress at the border with the March of Meissen. Soběslav routed and captured King Lothair, while Otto II was killed in battle. However, the relationship between the two countries returned to the former vassal-suzerain relation, as King Lothair was released on condition of Soběslav investiture with Bohemia.

Throughout his reign, he continued to possess the Olomouc duchy. Meanwhile however, the duke's rule in Bohemia was again undermined by his nephew, Bretislaus, son of Soběslav's eldest brother Duke Bretislaus II (d. 1100). Young Bretislaus referred to the principle of agnatic seniority and had the support of the Moravian dukes, Conrad II of Znojmo and Vratislaus II of Brno, as well as of the church party under Bishop Meinhard of Prague. In June 1130, the conspiracy was discovered and thwarted with much bloodshed. The dukes survived and continued to rule, but Bretislaus was blinded. Upon the accession of his brother-in-law King Bela II of Hungary in 1131 he was entangled into an armed conflict with Duke Bolesław III of Poland, who supported Bela's rival Boris Kalamanos.

Conrad III of Hohenstaufen, elected King of the Romans in 1138, tried to amend relations between the two thrones of Bohemia and Germany. At the Reichstag of Bamberg in the same year, he gave Soběslav the hereditary dignity of the archcupbearer of the Holy Roman Empire and the promise

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