According to Adam of Bremen, his body was buried in Birka, but his head was entombed in Bremen Cathedral. When the altar was taken down in 1840, a leaden plate was found with the inscription "VNNIS ARCHIEP(is)-C(opus)". After Ansgar and Rimbert of Turholt, epithetised Apostle of the North and second Apostle of the North, Unni is revered as third Apostle of the North and as Saint.
- Tegnér, Göran (1995), "Unni", Vikingatidens ABC, Swedish Museum of National Antiquities, ISBN 91-7192-984-3, archived from the original on 2007-09-01, retrieved 2007-08-19
- Besides Rimbert also the missionary Sigfrid of Sweden and the Reformator Johannes Bugenhagen were each likewise honoured as second Apostle of the North. Cf. Erik Gustaf Geijer, Geschichte Schwedens [Svenska folkets historia; German]: 6 vols., Swen Peter Leffler (trl., vols. 1-3), Friedrich Ferdinand Carlson (trl., vols. 4-6) and J. E. Peterson (co-trl., vol. 4), Hamburg and Gotha: Friedrich Perthes, 1832-1887, (Geschichte der europaeischen Staaten, Arnold Hermann Ludwig Heeren, Friedrich August Ukert, and (as of 1875) Wilhelm von Gieselbrecht (eds.); No. 7), vol. 1 (1832), p. 121. No ISBN.
- Herbermann, Charles, ed. (1913). "Hamburg". Catholic Encyclopedia. New York: Robert Appleton Company.
UnniBorn: unknown Died: 17 September 936 in Birka
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| Archbishop of Bremen-Hamburg
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