Person:Frederick II, Duke of Swabia (1)

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Frederick II "the One Eyed" von Staufen, Duke of Swabia
d.6 Apr 1147 Schwaben, Germany
Facts and Events
Name Frederick II "the One Eyed" von Staufen, Duke of Swabia
Alt Name , Emperor - Holy Roman Empire II
Gender Male
Birth? 1090 Hohenstaufen, Württemberg, Germany
Marriage 1121 Germanyto Judith , Princess of Bavaria
Other Marriage Ending Status Divorce
with Judith , Princess of Bavaria
Death? 6 Apr 1147 Schwaben, Germany
Other? House of Hohenstaufen


the text in this section is copied from an article in Wikipedia

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 Guelph. 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 Lothar III, crowned Emperor later in 1133.

A conflict erupted between Frederick and his supporters, and Lothar. Encouraged by Adalbert of Mainz, who loathed the supporters of the late Emperor Henry V, Lothar 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 Lothar 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 Lothar. After Lothar's death (1137) and election of Conrad as King of the Romans (1138) Frederick supported his brother in the struggle with Guelphs. 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.

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References
  1.   Frederick II, Duke of Swabia, in Wikipedia: The Free Encyclopedia. (Online: Wikimedia Foundation, Inc.).
  2.   FRIEDRICH von Staufen (1090-Alzey 4 or 6 Apr 1147, bur Walburg Abbey), in Cawley, Charles. Medieval Lands: A prosopography of medieval European noble and royal families.