Second Battle of Chlumec

Battle of Chlumec
King Lothar III at the Battle of Chlumec
Date February 18, 1126 Location Chlumec, Duchy of Bohemia Result Bohemian victory
Belligerents
Duchy of Bohemia	Holy Roman Empire
Commanders and leaders
Soběslav I of Bohemia	Lothair III of Germany Otto II the Black †

The Battle of Chlumec was the culmination of a 12th-century war of succession in the Duchy of Bohemia. It occurred on 18 February 1126 in the vicinity of the village of Chlumec (German: Kulm) near Chabařovice on the southern slopes of the Eastern Ore Mountains. The Bohemian forces led by Duke Soběslav I defeated an Imperial contingent of troops under King Lothair III of Germany and his Moravian ally Duke Otto II the Black.

Since Duke Bretislaus I of Bohemia had implemented the inheritance principle of agnatic seniority in the 11th century, the order of succession in Bohemia, many rivalling scions of the ramified Přemyslid dynasty waged war against each other. The claimants to the Prague throne sought for formal recognition by the Holy Roman Emperor, actually, the accession required the active support by the Bohemian nobility.

The Přemyslid duke Vladislaus I of Bohemia, ruling since 1109, likewise had to struggle to consolidate his authority, defying the claims raised by his brother Bořivoj II who had reached his enfeoffment by Emperor Henry IV in 1101. When Vladislaus died in 1125 his succession was disputed among his surviving brother Soběslav I and his Moravian cousin Otto II, duke in Olomouc and Brno. Otto could appeal to the agnatic seniority principle, he also reached the support of Vladislaus' widow Richeza of Berg and King Lothair III.

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