The Norse sagas give accounts of the rules of dueling in the Viking Age holmganga. There are also longship illustrations similar to Viking ships. Norway participated by sending the "Viking", a replica of the Gokstad ship. The majority of runic inscriptions from the Viking period are found in Sweden. Sagas of the Viking Age often mention Berserkers. They eventually organised it as the kingdom of England in the face of Viking invasions. Elderly Viking and one of Ragnar's warriors. Several of the original longships built in the Viking Age have been excavated by archaeologists. The Mainland contains the remnants of numerous Neolithic, Pictish and Viking constructions. Spears are the only type of polearms found in Viking graves. It was invented for the heat shields flown on the Viking Mars lander missions. This is a list of Viking metal bands. Catherine Hoad finds the issue of national and racial identity central to Viking metal. Other runestones mention men who died on Viking expeditions. Alfred also oversaw the conversion of Viking leader Guthrum to Christianity.