Ибн Фадлан
During the mid-9th century, there was an influx of these high-quality weapons into Scandinavia, and Frankish arms became the standard for all Vikings. As Ahmad ibn Fadlan observed in his account of his journey to Russia, every Viking carried a "sword of the Frankish type". The Franks attempted to limit the Vikings' use of weapons and armour produced in Francia—fearing that they would eventually face equally armed opponents. Chapter 10 of the "Capitulare Bononiense" of 811 made it illegal for any clerical functionary to supply swords or armour to non-Frankish individuals. Laws like this were enacted throughout Francia. Ultimately, in 864, King Charles the Bald of West Francia made the practice punishable by death.