sentences:  Chinese scholars travelling through the region between the 5th and 8th centuries, such as Faxian, Xuanzang, I-ching, Hui-sheng, and Sung-Yun, began to speak of a decline of the Buddhist "Sangha", especially in the wake of the Hun invasion from central Asia.Xuanzang, the most famous of Chinese travellers, found “millions of monasteries” in north-western India reduced to ruins by the Huns.The Muslim conquest of the Indian subcontinent was the first great iconoclastic invasion into South Asia.