I think it is the first one
Hope this help you!
Answer:
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Please respect your question
The Gregorian calendar is currently used in the Western World, both as the civil and Christian ecclesiastical calendar.
Its original form was the Julian calendar (proposed by Julius Caesar).
The Gregorian calendar was introduced by Pope Gregory XIII in October 1582.
Depends on Emperor, but mainly was the army. The army conquered many lands such as the land now called England. They even got as fair to Asia, before being pushed back. As well when conquering those lands, they gained Servus or slaves. That could then go to be a Tiro, or Auxilia. With all of that brought power and wealth. As well a lasting image of how terrifying the empire was.
