text: After refusing an order of Maximian, a Roman legion composed of 6,600 members of this group was decimated at Agaunum and later utterly massacred.
full_question: After refusing an order of Maximian, a Roman legion composed of 6,600 members of this group was decimated at Agaunum and later utterly massacred. Officially, thurificati, libellatici, and traditores were classes of lapsi, a collective term for people who broke from this group, which made up the Theban Legion. While governor of Bithynia-Pontus, Pliny the Younger wrote a letter to Trajan asking for advice on dealing with these people, who Decius targeted in a law requiring public sacrifice. This group, which populated much of Rome's Aventine and Trastevere areas, made heavy use of catacombs. These people were officially tolerated after the Edict of Milan. For 10 points, name this religious group that Constantine I joined after he saw a cross in the sky.
first_sentence: After refusing an order of Maximian, a Roman legion composed of 6,600 members of this group was decimated at Agaunum and later utterly massacred.
raw_answer: Christians [accept anything indicating followers of Christ in the Roman Empire]