Frederick II, Duke of Swabia

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Frederick, Duke II of Swabia
Frederick II of Swabia.jpg
Frederick, Duke II of Swabia
Spouse(s) Judith of Bavaria
Agnes of Saarbrücken
Noble family Hohenstaufen
Father Frederick I, Duke of Swabia
Mother Agnes of Germany
Born 1090
Died 6 April 1147(1147-04-06)

Frederick II (1090 – 6 April 1147), called the One-Eyed, was the second Hohenstaufen Duke of Swabia from 1105. He was the eldest son of Frederick I and Agnes.

He succeeded his father in 1105. In 1121 he married Judith of Bavaria, a member of the powerful House of Welf. On the death of Emperor Henry V, his uncle, Frederick stood for election as King of the Romans with the support of his younger brother Conrad, Duke of Franconia and several houses. However, he lost this election of 1125 to Lothair II, crowned Emperor later in 1133.

A conflict erupted between Frederick and his supporters, and Lothair. Encouraged by Adalbert of Mainz, who loathed the supporters of the late Emperor Henry V, Lothair besieged Nuremberg in 1127. Frederick relieved the siege of Nuremberg in 1127 and occupied Speyer in 1128. The attempt of Henry the Proud, duke of Bavaria, to capture Frederick during negotiations failed (1129). However, afterwards supporters of Lothair won a number of victories both in Germany and in Italy. Speyer (1129), Nuremberg (1130) and Ulm (1134) were captured and in October 1134 Frederick submitted to the emperor. In 1135 both Frederick and Conrad were finally reconciled with Lothair. After Lothair's death (1137) and the election of Conrad as King of the Romans (1138) Frederick supported his brother in the struggle with Welfs. According to Otto of Freising, Frederick was "so faithful a knight to his sovereign and so helpful a friend to his uncle that by valor he supported the tottering honor of the realm, fighting manfully against its foes..."

Frederick's second wife, Agnes, was the niece of his old enemy Albert of Mainz.


With Judith of Bavaria (1103- 22 February 1131), daughter of Henry IX, Duke of Bavaria:

With Agnes of Saarbrücken (d. c. 1147), daughter of Frederick, Count of Saarbrücken:


See also[edit]


  1. ^ Charles Cawley, Medieval Lands, Swabia
Frederick II, Duke of Swabia
Born: 1090 Died: 1147
German royalty
Regnal titles
Preceded by
Frederick I
Duke of Swabia
Succeeded by
Frederick III Barbarossa