Although nontrinitarian beliefs continued and were dominant among some peoples—for example, the Lombards, Ostrogoths, Visigoths and Vandals—for hundreds of years, the Trinity doctrine eventually gained prominence in the Roman Empire. Nontrinitarians typically argue that early nontrinitarian beliefs, such as Arianism, were systematically suppressed (often to the point of death).[39] After the First Council of Nicaea, Roman Emperor Constantine I issued an edict against Arius' writings, which included systematic book burning.[40] In spite of the decree, Constantine ordered the readmission of Arius to the church, removed the bishops (including Athanasius) who upheld the teaching of Nicaea,[41] allowed Arianism to grow within the Empire and to spread to Germanic tribes on the frontier,[42] and was himself baptized by an Arian bishop, Eusebius of Nicomedia.[43] His successors as Christian emperors promoted Arianism, until Theodosius I came to the throne in 379 and supported Nicene Christianity.