The online lecture "Tiešsaistes lekcija "Reliģiju vēsture: imperators Konstantīns un pirmās ekumeniskās padomes"" takes place via ZOOM livestream on 20 October 2026. It explores the 4th and 5th centuries, when Christianity gradually changed from a persecuted religion into the faith of the Roman Empire. The programme covers Emperor Constantine and the Edict of Milan, the Christianisation of Armenia, Arianism and the Council of Nicaea, as well as Julian the Apostate and Theodosius the Great. The lecture also examines the formation of church structures, theological disputes, and the influence of the Councils of Ephesus and Chalcedon on later Christian history.