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Need some help identifying some ancients

In the course of doing some "spring cleaning" - coin collector version, I came across these four very small (1/2 inch diameter) coins that are either ancients or close to it. I know virtually nothing about these, so I thought I would tap the knowledge of the group for help in identifying them. I have attached a couple of photos. Thanks!
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Your first picture hasn't uploaded properly (at least I can't see anything on my end), so just judging what I'm seeing in the second picture:
Roman emperor Marcus Aurelius, "Meditations"
Apparently I have been awarded the DPOTD twice.
Thank you! I hadn't expected such a thorough and complete answer so quickly, especially since these coins are both so small and well-worn.