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Nestorianism, a branch of Christianity, was introduced into China during the reign of Emperor Taizong. Nestorius (c. 386-c. 451), the founder, was condemned for practicing heresy and expelled by the Roman Church in 431. He later died in exile in the deserts of western Egypt. His followers seceded from the Roman Church and started spreading their religion to the east. Olopen (birth and death dates unknown), one of their archbishops, arrived in Chang'an in 635 with his retinue, calling themselves "Nestorians." Emperor Taizong appointed Prime Minister Fang Xuanling (579-648) to welcome them and assigned the imperial library to them to translate their religious scriptures. The government even provided funds for the newcomers to build a church in the capital city.