In 1644 Balkh historian Mahmud ibn Vali wrote that Afak Khan ruled for 12 years. Mahmud ibn Vali's book, "Bahr al-Asrar" ( "Sea of Mysteries"), was written in 7 parts between 1641 and 1644 in Balkh. Each part contained 4 chapters. The second chapter of 7th part described the rulers of the Yarkand Khanate, or the country of Kashgar and Uyghurstan as he called it, from the time of Sultan Said Khan to the time of Abdal Latif Sultan (Afak Khan).
