Saya mau tau Serangan Viking dari Karl yang Gendut

Pada masa kekuasaan Karl, bangsa Viking melakukan penjarahan di wilayah Francia Barat dan Tengah. Dua kali Karl membayar para penyerbu Viking agar dapat memperoleh perdamaian, termasuk selama Pengepungan Paris (885–886).

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MacLean, Simon. Kingship and Politics in the Late Ninth Century: Charles the Fat and the end of the Carolingian Empire. Cambridge University Press: 2003.

Reuter, Timothy. Germany in the Early Middle Ages, c. 800–1056. Longman, 1991.

Reuter, Timothy (trans.) The Annals of Fulda. (Manchester Medieval series, Ninth-Century Histories, Volume II.) Manchester: Manchester University Press, 1992.

Smith, Julia M. H. Province and Empire: Brittany and the Carolingians. Cambridge University Press: 1992.

Annales Fuldenses translated by Timothy Reuter, with commentary (subscription needed)., medievalsources.co.uk