Question

what was the fixed facet of religion across the roman empire? celebration during saturnalia reverence for jupiter loyalty to caesar

Explanation:

In the Roman Empire, loyalty to the emperor (referred to here as "loyalty to Caesar," using the name of a prominent Roman leader as a symbol) was a fixed and unifying aspect of religion. The Roman state - religion often intertwined with political loyalty. While there were various local religious practices and reverence for different gods like Jupiter in different regions, the overarching and unifying religious - political requirement was loyalty to the emperor. Saturnalia was a festival, not a fixed unifying religious facet across the entire empire in the same sense as imperial loyalty. Reverence for Jupiter was more of a traditional Roman religious element but not as uniformly enforced as loyalty to the emperor as a religious - political duty.

Answer:

loyalty to Caesar