Achaemenian

[ak-uh-mee-nee-uh n]

of or relating to the Achaemenids or their language, as recorded in cuneiform inscriptions.

Origin of Achaemenian

1710–20; < Latin Achaemeni(us) (< Greek Achaimén(ēs) Achaemenes + Latin -ius adj. suffix) + -an

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

He is indeed the only monarch of the Achaemenian line who appears to have been bloodthirsty by temperament.
The Seven Great Monarchies Of The Ancient Eastern World, Vol 5. (of 7): Persia|George Rawlinson
The Saseanian reliefs need not on the whole shrink from a comparison with those of the Achaemenian Persians.
The Seven Great Monarchies Of The Ancient Eastern World, Vol 7. (of 7): The Sassanian or New Persian Empire|George Rawlinson
The Achaemenian sovereign did not hesitate to forestall the attack, and promptly assumed the offensive.
History Of Egypt, Chalda, Syria, Babylonia, and Assyria, Volume 9 (of 12)|G. Maspero
Anzan had been first occupied, it would appear, by his great-grandfather Teispes the Achaemenian.
A Primer of Assyriology|Archibald Henry Sayce