Ariarathes I of Cappadocia

4th-century BC king of Cappadocia

Ariarathes I was the last Achaemenid Persian governor (satrap) of the province (satrapy) of Northern Cappadocia, serving from the 340s BC to 331 BC. He led defensive efforts against the Macedonian invasion, commanded by Alexander the Great, and later fought at the Battle of Gaugamela under Darius III, the last King of Kings of the Achaemenid Empire. After the fall of the Achaemenid Empire, Ariarathes continued his resistance against the Macedonians, ruling concomitantly as an Achaemenid remnant and a precursor to the Kingdom of Cappadocia. He is regarded as the founder of the Iranian Ariarathid dynasty.

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