In 250 AD, the emperor Decius issued a decree requiring public sacrifice, a formality equivalent to a testimonial of allegiance to the emperor and the established order. There is no evidence that the decree was intended to target Christians but was intended as a form of loyalty oath. Decius authorized roving commissions visiting the cities and villages to supervise the execution of the sacrifices and to deliver written certificates to all citizens who performed them. Christians were often given opportunities to avoid further punishment by publicly offering sacrifices or burning incense to Roman gods, and were accused by the Romans of impiety when they refused. Refusal was punished by arrest, imprisonment, torture, and executions. Christians fled to safe havens in the countryside and some purchased their certificates, called "libelli." Several councils held at Carthage debated the extent to which the community should accept these lapsed Christians.