Ottokar I was Duke of Bohemia periodically beginning in 1192, then acquired the title of King of Bohemia, first in 1198 from Philip of Swabia, later in 1203 from Otto IV of Brunswick and in 1212 from Frederick II. He was an eminent member of the Přemyslid dynasty.
Contemporary relief carving of Ottokar I in the tympanum of St George's Convent, Prague
Ottokar and Constance, from the Landgrafenpsalter (1211–13)
Philip of Swabia, styled Philip II in his charters, was a member of the House of Hohenstaufen and King of Germany from 1198 until his assassination.
Philip of Swabia with the Imperial Regalia, miniature in the Chronicle of Weissenau Abbey, ca. 1250. Kantonsbibliothek St. Gallen (Vadiana Collection, Ms. 321, p. 40.)
Frederick Barbarossa with his sons Henry and Philip, from Peter of Eboli Liber ad honorem Augusti, 1196. Burgerbibliothek of Berne, Codex 120 II, fol. 143r.
Philip of Swabia. Chronica Sancti Pantaleonis, Köln, Kloster St. Pantaleon, ca. 1237. Wolfenbüttel, Herzog August Library, Cod. Guelf. 74.3 Aug. 2°.
Philip of Swabia. Chronica regia Coloniensis (13th century), Brussels, Royal Library of Belgium, Ms. 467, fol. 138r.