Frederick of Tuscany
Boniface IV Frederick was the only son of Boniface III of Tuscany
Boniface III of Tuscany
Boniface III , son of Tedald of Canossa and the father of Matilda of Canossa, was the most powerful north Italian prince of his age...

 and Beatrice of Bar
Beatrice of Bar
Beatrice of Bar was the marchioness of Tuscany from 1053 to her death as the wife of Boniface III of Tuscany...

. He was young when his father died on 6 May 1052 and he inherited the great north Italian margraviate.

His mother served as his regent
A regent, from the Latin regens "one who reigns", is a person selected to act as head of state because the ruler is a minor, not present, or debilitated. Currently there are only two ruling Regencies in the world, sovereign Liechtenstein and the Malaysian constitutive state of Terengganu...

 until 1054, when she married Godfrey
Godfrey III, Duke of Lower Lorraine
Godfrey III , called the Bearded, was the eldest son of Gothelo I, duke of Upper and Lower Lorraine. By inheritance, he was count of Verdun and he became margrave of Antwerp as a vassal of the duke of Lower Lorraine...

, former duke of Lower Lorraine. Godfrey was a traitor to Henry III, Holy Roman Emperor
Henry III, Holy Roman Emperor
Henry III , called the Black or the Pious, was a member of the Salian Dynasty of Holy Roman Emperors...

, and thus the marriage was considered traitorous. In 1055, Henry held a court at Florence
Florence is the capital city of the Italian region of Tuscany and of the province of Florence. It is the most populous city in Tuscany, with approximately 370,000 inhabitants, expanding to over 1.5 million in the metropolitan area....

 and arrested Beatrice, while Godfrey was rebelling in Lorraine. Henry bade Frederick come, but the child refused. It was no matter, for he died a few days thence and the margraviate passed to his sister Matilda
Matilda of Tuscany
Matilda of Tuscany was an Italian noblewoman, the principal Italian supporter of Pope Gregory VII during the Investiture Controversy. She is one of the few medieval women to be remembered for her military accomplishments...



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