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Ingiburga of Sweden daughter of Hacon seal . Hertuginne Ingeborgs segl fra en The seal of dutchess Ingeborg from arkivverket no html from plate XIV in Norske kongesigiller og andre fyrstesigiller fra middelalderen by Chr Brinchmann Carl Fredrik Lindberg employed as draftsman by Kungl Vitterhetsakademien px PDold Medieval