Who ruled first Marcus Aurelius or Constantine the great?

Marcus Aurelius ruled first, serving as Roman Emperor from 161 to 180 AD. Constantine the Great, on the other hand, became emperor later, ruling from 306 to 337 AD. Their reigns were separated by more than a century, with Marcus Aurelius being part of the Five Good Emperors and Constantine known for his significant role in the spread of Christianity and the establishment of Constantinople.