Answer :
The primary enduring effect of Theodosius' great rule was that the Romans were truly Christians.
What is an enduring effect?
This is a sudden and powerful permanent or lasting effect or impact that something has on a situation, person or process.
Theodosius I, also called Theodosius the Great, was a Roman emperor from 379 to 395.
Theodosius was the Emperor who initiated a number of measures that resulted in the Romans embracing paganism in many areas of the empire. He also was responsible for the Nicene Creed to become the state religion.
Hence, amidst all these, his legacy and rule brought about the historical significance of ensuring that the roman empire was truly Christian.
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