Prokles (circa 400 BC) was a descendant of the exiled Spartan king Demaratus, and ruler of Pergamon in Asia Minor under the Achaemenid Empire.
After his deposition in 491 BC Demaratus had fled to Persia, where king Darius I made him ruler of the cities of Pergamon, Teuthrania and Halisarna.
[1] Xenophon and the Ten Thousand received some support from Prokles in facing Achaemenid troops, at the beginning of their campaign into Asia Minor.
[2] According to Xenophon (Anabasis, 7.8.8-17), when he arrived in Mysia in 399, he met Hellas, the widow of Gongylos and probably daughter of Themistocles,[3] who was living at Pergamon.
[6] The city of Pergamon was later taken over by the Spartan general Thibron, who was fighting against the Achaemenid Satrap of Lydia and Ionia Tissaphernes.