While residing in the city of Luoyang (in Henan in Central China), Xuanzang was ordained as a "śrāmaṇera" (novice monk) at the age of thirteen. Due to the political and social unrest caused by the fall of the Sui dynasty, he went to Chengdu in Sichuan, where he was ordained as a "bhikṣu" (full monk) at the age of twenty. He later traveled throughout China in search of sacred books of Buddhism. At length, he came to Chang'an, then under the peaceful rule of Emperor Taizong of Tang, where Xuanzang developed the desire to visit India. He knew about Faxian's visit to India and, like him, was concerned about the incomplete and misinterpreted nature of the Buddhist texts that had reached China.