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Ottonis Gesta Friderici I. imperatoris, MGH SS rer. Germ. 46, p. 23
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Ottonis Gesta Friderici I. imperatoris, MGH SS rer. Germ. 46, p. 23
Ottonis Gesta Friderici I. imperatoris, MGH SS rer. Germ. 46, p. 23