Rex sacrorum was a Roman priest that performed the religious duties of a king after the monarchy was overthrown in Rome. He was severely limited in his influence on political life.
In the middle of the 2nd century CE, on the shore of the Black Sea, any visitor could have had his future foretold by a divine snake with a human-like head, called Glycon. The serpent and his prophet Alexander were so respected, even the philosopher-emperor Marcus Aurelius asked them for help.
In 335 CE the (First) Synod of Tyre had to deal with a scandal far exceeding the usual quarrels about theological details. Athanasius, the bishop of Alexandria, and one of the most prominent figures of the Christian church faced a serious accusation.
We tried to provide the list of most important theological (mostly Christological) heresies that occurred in Antiquity.