Many early Christians, including some of the Church fathers such as Justin Martyr, actually called themselves Chrestians rather than Christians. Marcionites referred not to Jesus Christ, but to Isu Chrestos. The oldest known Christian inscription, dating from 318 AD, was found over the doorway to a Marcionite Church and read, “The Lord and Saviour Jesus the Good” – the title Chrestos being used rather than Christos. According to Lactantius, another early Christian writer, “it is only through ignorance that men call themselves Christians instead of Chréstians."
Dr. Will Rogers,
Author, Christos Chrestos