sentences:  As such, patrilineal Muslim values are believed to have been superimposed upon the Tuareg's traditional matrilineal society.Other, apparently newer customs include the practice of close-cousin endogamous marriages and polygyny in conformity with Islamic tenets.Polygyny, which has been witnessed among Tuareg chiefs and Islamic scholars, is in turn thought to be contrary to the pre-Islamic monogamous tradition of the nomadic Tuareg.