Ariarathes I (Ancient Greek: Ἀριαράθης Ariaráthēs; died 322 BC) was the satrap of the Satrapy of Cappadocia under the Achaemenid Empire from 350 BC to 331 BC, and the King of Cappadocia from 331 BC until his death in 322 BC. He was the son of the Cappadocian satrap Ariamnes I. Ariarathes was distinguished (Φιλάδελφος, Philádelphos) for his love of his brother Holophernes, whom he sent to assist his overlord king Artaxerxes III in the recovery of Egypt, in 350 BC. Then he devotedly supported Darius III. Alexander the Great conquered Cappadocia during his route and installed a governor there (though two different names of this governor are given). Nevertheless, by the time of Alexander's death Ariarathes somehow assumed power as the first king of Cappadocians and even expanded the kingdom by