Japan's monastic warriors have fared poorly in comparison to the samurai, both in terms of historical reputation and representations in popular culture. Often maligned and criticized for their involvement in politics and other secular matters, they have been seen as figures separate from the larger military class. However, as Mikael Adolphson reveals in his comprehensive and authoritative examination of the social origins of the monastic forces, political conditions, and warfare practices of the Heian (794-1185) and Kamakura (1185-1333) eras, these monk-warriors (sohei) were in reality inseparable from the warrior class. Their negative image, Adolphson argues, is a construct that grew out of artistic sources critical of the established temples from the fourteenth century on.