The Premyslid dynasty was a Czech royal dynasty that reigned in Bohemia and Moravia from the 9th century to 1306, in addition to ruling parts of Hungary, Austria, Silesia, and Poland. The Premyslids expanded from Prague to conquer all of Bohemia, and Borivoj I of Bohemia would become the first Premyslid duke in 867. The Premyslids founded the city of Wroclaw (also known as Breslau) in Silesia, naming it for Vratislaus I of Bohemia, ruler from 915 to 921. In 1085, Vratislaus II of Bohemia became the first King of Bohemia, and an 1126 Bohemian victory over the Holy Roman Empire at Chlumec led to the rise of the Premyslids. In the second half of the 13th century, King Ottokar II of Bohemia conquered Austria, Styria, Carinthia, and Carniola, expanding Bohemian territory to the Adriatic Sea. However, Ottokar was killed at the Battle of Marchfeld in 1278 while attempting to steal the crown of the Holy Roman Empire, and the House of Habsburg assumed control of the Duchy of Austria. After the death of Wenceslaus II of Bohemia in 1305 and the assassination of his son, Wenceslaus III of Bohemia, in 1306, the Premyslids went extinct. However, Wenceslaus' grandson Charles succeeded in becoming Holy Roman Emperor in 1355 as a member of the House of Luxembourg.