It was an agreement to treat christians nicely/fairly in the Roman Empire, rather than treating them poorly. It was later that christianity became the most popular religion there. Hope I helped :)
Europe came under the rule of one emperor when Charlemagne was crowned.
1. several aspects of nature, astronomy and rituals.
2. religious rituals
Hopefully this answered your question
<span>Economic, social and political structures differed significantly between the two regions, and these disparities only widened in the 1800s. In 1861, the Civil War erupted between the two sides, and much of the conflict surrounded sectional differences. Once the war ended, reconstruction lessened some sectional disparities but increased others.</span>