Arius (AD 250 or 256–336) was a North African priest who taught that Christ was not God. Although his teaching was condemned by the Council of Nicaea in 325 – where St Nicholas famously slapped him – after Emperor Constantine the Great’s death subsequent emperors adopted it and persecuted the orthodox. Even Pope Liberius was forced to sign a semi-Arian creed. Only five bishops of the thousands then sitting stood up for the Divinity of Christ, and St Jerome declared that “the world woke, and groaned to find itself Arian”.