Otto II the Black

Černý; c. 1085 – 18 February 1126), a member of the Přemyslid dynasty, ruled as a Moravian prince in Olomouc from 1107 and in Brno from 1123 until his death.

He was a younger son of Prince Otto I of Olomouc and his wife Euphemia, a daughter of the Árpád king Béla I of Hungary.

While the dynastical struggles within the Přemyslid family continued, Otto II and Svatopluk were able to return to Moravia in 1091.

When Vladislav's brother Soběslav succeeded, Otto turned to King Lothair II who marched against Bohemia with a German army.

Both sides met in the Battle of Chlumec on 18 February 1126: Lothair's forces were decisively defeated and Otto was killed in action.