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Gesta Friderici Imperatoris Ottonis Frisingensis I. 39, MGH SS 20, p. 373
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Gesta Friderici Imperatoris Ottonis Frisingensis I. 39, MGH SS 20, p. 373
Gesta Friderici Imperatoris Ottonis Frisingensis I. 39, MGH SS 20, p. 373