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Gesta Friderici Imperatoris Ottonis Frisingensis II. 16, MGH SS 20, p. 399
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Gesta Friderici Imperatoris Ottonis Frisingensis II. 16, MGH SS 20, p. 399
Gesta Friderici Imperatoris Ottonis Frisingensis II. 16, MGH SS 20, p. 399