The third period, stretching from the Mongol invasion to the establishment of the Safavids, is the most obscure because the sources of this period have not been well studied. Just as the political and social historyof this period is not well known,due tothe general turmoil of the age and the presence of so many local dynasties, so the details of the religious life of Shi'ism in this age are as yet unknown.

Ideals and realities of Islam On page 161 Saturday, January 5, 2013 @ 4:45pm