Final answer:
The perfect fusion of Christendom and Greek/Roman art occurred during the period following the Emperor Constantine's acceptance of Christianity and his patronage of the religion in the early fourth century. This fusion can be seen in the adaptation of aesthetic principles and mythological subjects, as well as the replication and emulation of Greek sculptures by Roman artists.
Step-by-step explanation:
The perfect fusion of Christendom and Greek/Roman art occurred during the period following the Emperor Constantine's acceptance of Christianity and his patronage of the religion in the early fourth century.
During this time, there was a cultural interaction between Christian theology and art with the Greco-Roman world, which enriched the creation and nature of Christian art.
The influence of Greek/Roman art on Christian art can be seen in the adaptation of aesthetic principles and mythological subjects, as well as the replication and emulation of Greek sculptures by Roman artists.