The Gesta Episcoporum Virdunensium names "filius huius Theoderici fuit iunior Frederici, qui mortuus est ante patrem suum" and his two daughters.
He was titled duke during the lifetime of his father, sometimes referred to as FREDERIC II Duke of Upper Lotharingia, but Poull believes he was not appointed associate duke. He allied himself with Foulques III "Nerra" Comte d'Anjou to support his father against Eudes II Comte de Blois, fighting him at Pontlevoy and in Champagne. He opposed the election of Konrad II King of Germany in 1024, and refused to swear allegiance to him. He made contact with the Italian lords who were also opposed to the new king. The rebels offered the crown to Robert II King of France, who refused it, although he supported the movement and sent troops to attack Metz.
He was repulsed, but Duke Frederic was not discouraged and was planning a new revolt when he died. The necrology of Verdun Saint-Vanne records the death "XV Kal Jun" of "Fredericus dux". 2
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