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Gesta Friderici Imperatoris Ottonis Frisingensis I. 9, MGH SS XX, p. 358
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Gesta Friderici Imperatoris Ottonis Frisingensis I. 9, MGH SS XX, p. 358
Gesta Friderici Imperatoris Ottonis Frisingensis I. 9, MGH SS XX, p. 358