The Pax Romana began around 30 BCE with the rise of

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as leader of Rome and ended around 180 CE with the death of Emperor
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I think its Octovian and Marcus Aurelius am i right or is it Julius Caeser

You are partially correct. The Pax Romana began with Octavian, who later became known as Emperor Augustus. However, the Pax Romana ended with the death of Emperor Marcus Aurelius in 180 CE. Julius Caesar was not directly involved in the Pax Romana as he was assassinated in 44 BCE.

So Octovian and Marcus?

Yes, that's correct. The Pax Romana began with Octavian (Emperor Augustus) and ended with the death of Emperor Marcus Aurelius.