Frederick I

Frederick I was the name of several European monarchs:

Frederick I, Archbishop of Cologne (c. 1075-1171)
Frederick I, Holy Roman Emperor (1122-1190); "Frederick Barbarossa"
Frederick I of Babenberg, Duke of Austria (c.1175-1198)
Frederick I of Habsburg, Duke of Austria (1286-1330); "Frederick the Handsome"
Frederick I, Elector of Saxony (1370-1428)
Frederick I, Margrave of Brandenburg (1371-1440), also Burgrave of Nuremberg (as Frederick VI)
Frederick I, King of Denmark and Norway (1471-1533)
Frederick I, Duke of Württemberg (1557-1608)
Frederick I, King in Prussia (1657-1713)
Frederick I, King of Sweden (1676-1751)
Frederick I, King of Württemberg (1754-1816)
Frederick I, Count Palatine of the Rhine (1449–1476)
Frederick I, Duke of Saxe-Gotha-Altenburg (1646-1691)