Mark's second post deals with his discovery that Paul of Tarsus was actually a sequel to a series called Jesus of Nazareth which aired in 1956. Various productions have gone by this name - in addition to Zeffirelli's famous 1977 TV series, there were silent film versions in 1916 (a theologically modified release of From the Manger to the Cross and 1928 as well as a Mexican version in 1942 - but this one was unknown to me. According to the IMDb it starred Tom Flemming in the lead role. Flemming went on to commentate on the 1972 Eurovision Song contest.
I'll not reproduce Mark's comments here, but would encourage those interested in these films to read his original posts for themselves.
I've also checked both Campbell and Pitts and Kinnard and Davis, and neither book mentions either series.