King of the Romans was a royal title used by the king of East Francia following his election by the princes from the reign of Henry II onward.
The royal Throne of Charlemagne in Aachen Cathedral
Detail of the imperial coronation mantle, drawing from 1857
Armor of Ferdinand I, Holy Roman Emperor, created when he was still King of the Romans in 1549.
Coronation of Archduke Joseph as King of the Romans in the Imperial Cathedral of Saint Bartholomew in Frankfurt, 3 April 1764
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.