Which event would be placed earliest on a timeline about the leader ship of rome

46 BCE: Julius Caesar became dictator.

Explanation:

The remainder of the question is:

46 BCE: Julius Caesar became dictator.

306 CE: Constantine I was proclaimed emperor.

161 CE: Marcus Aurelius was named emperor.

101 BCE: Gaius Marius was elected consul.

Rome started in 753 BCE, by 509 BCE, the republic began as well. By 218 BCE, Rome was attacked by Hannibal of Carthage. By 45 BCE after the civil war was won by Julio Caesar, he became a dictator.

It should also be noted that BCE simply means before the common era while CE means the common area. Based on the above explanation, the answer is A.

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