Let’s see:
Darius is the featured figure on the coin, but we don’t know how the coin got its “Darics” moniker...
It’s probably a pun.
It turns out an inept would-be assassin Archer tried but failed to kill Darius.
You can see where a piece of Darius’ ear is missing from the attempt. There were questions as to whether Darius was hit by the assassin’s arrow or perhaps by shrapnel from the nearby Court Jester’s lute, which after the attack was miraculously found to be fully intact, in tune and playable. (The Court Jester, on the other hand, was no longer funny and had to be replaced.)