Your probably closer than mine.
Here's another with the NIAKH, but misattributed to a horse grazing right:
Thessalonica, Macedonia, AE19. 187-31 BC. Head of Athena right / QESSALONIKH, horse grazing right.
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Don......
A candidate for your second coin:
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Byzantine coin (1st century) with a bust of Artemis (Diana) on the obverse and an eight-rayed star within a crescent on the reverse side.
Coin may have come from Byzantium (Istanbul, today).
Don......