Nasir Khusraw (b. 1004) was a Persian Ismaili poet, philosopher, traveller and missionary (dai), famous for his Safarnama travelogue and Ismaili philosophical works. After a spiritual conversion around age forty he travelled to Fatimid Cairo, rose to high Ismaili rank, and around 1060 fled persecution to the remote Yamgan valley in Badakhshan. He spent his last decades there, dying after 481 AH/1088 CE, and rests in a shrine at Hazrat-e Sayyed village, still venerated by Central Asian Ismailis. (Sources: Wikipedia 'Nasir Khusraw'; Archnet 'Shrine of Nasir Khusraw'; AKDN)