Six programmes on the civilisations of Turkey
Written and introduced by John Julius Norwich

This week Lord Norwich traces the transformation of an empire. Constantine the Great not only made the Roman into a Christian Empire; he also moved his capital from Rome to the city that took his name, Constantinople.
This programme traces the transition from the Roman grandeur of Ephesus to the Byzantine splendour of St Sophia in Istanbul, for many centuries the largest Christian building in the world.