(), an Arcadian of Orchomenus, entered into the
service of Cyrus the Younger, and is introduced by Xenophon as refusing, in the name of the
Greeks, after the battle of Cunaxa, B. C. 401, to surrender their
arms at the requisition of Artaxerxes. (Xen. Anab. 2.1.10.)
After the treacherous apprehension of Clearchus and the other generals by Tissaphernes,
Cleanor was one of those who were appointed to fill their places, and seems to have acted
throughout the retreat with bravery and vigour. (Xen. Anab.
3.1.47, 2. §§ 4-6, 4.6.9.) When the Greeks
found themselves deceived by the adventurer Coeratades, under whom they had marched out of
Byzantium, Cleanor was among those who advised that they should enter the service of Seuthes,
the Thracian prince, who had conciliated him by the present of a horse. We find him afterwards
co-operating with Xenophon, of whom he seems to have had a high opinion, in his endeavour to
obtain from Seuthes the promised pay. (Xen. Anab. 7.2.2,
5.10.)