Julius Caesar came first, as he was born on July 12, 100 BC, while Marcus Aurelius was born much later on April 26, 121 AD. Caesar was a pivotal figure in the transformation of the Roman Republic into the Roman Empire, known for his military conquests and role in the politics of his time. In contrast, Marcus Aurelius reigned as emperor from 161 AD to 180 AD and is often remembered as a philosopher-king and author of the meditative work, ‘Meditations.’
In summary, the chronological gap between their births indicates that Julius Caesar predates Marcus Aurelius by over two centuries, making him the first of the two significant figures in Roman history.