Pope Anastasius I was the bishop of Rome from 27 November 399 to his death on 19 December 401.
Anastasius was born in Rome, and was the son of Maximus. He succeeded Siricius as pope and condemned the writings of the Alexandrian theologian Origen shortly after their translation into Latin. He fought against these writings throughout his papacy, and in 400 he called a council to discuss them. The council agreed that Origen was not faithful to the Church. If Origen has put forth any other writings, you are to know that they and their author are alike condemned by me. The Lord have you in safe keeping, my lord and brother deservedly held in honour. During his reign, he also encouraged Christians in North Africa to fight Donatism.