The period of the rise of Sufism or the period of scholarship and authorship: This period started from the beginning of the sixth century AH with the presence of Ahmad Ghazali (9th Qutb of Zahabiya, died 1131 CE) and ended until the end of the ninth century AH and the death of Khajeh Eshaq Khuttalani[22] (20th Qutb of Zahabiya, died 1424 or 1425 CE). Less than a century had passed since this period, when the Mongol invasion had just begun, and the defeat of Muhammad II of Khwarazm from Hulagu Khan confirmed the extinction of the Khwarazmian Empire (1231 CE, 628 AH). From this time on, great elders and seekers and many disciples emerged, each of whom, in addition to leaving lasting works of his own, became the source of remarkable literary services in the Persian language.