Various modern scholars of history and geography regarded the Vikings and their descendants as Gog and Magog, since the unknown group from Scandinavia had made their sudden and considerable entry into the history of Europe. Viking travellers and colonists were seen at many points in history as violent raiders. Many historical documents suggest that their conquests of other territories was retaliation in response to the encroachment upon tribal lands by Christian missionaries, and perhaps by the Saxon Wars prosecuted by Charlemagne and his kin to the south. Researches of professors and philosophers such as Allama Muhammad Iqbal, Syeed Abul Ala Mawdudi, who played important roles in British and South Asian politics, and American academic Abu Ammaar Yasir Qadhi and Caribbean eschatologist Imran N. Hosein, compare the languages, behaviours and sexual activities of the tribes of Gog and Magog with those of Vikings.