Lewis Short
chīlĭarchēs | chīlĭarchus, i (noun M) : or , , , = χιλιάρχης or χιλίαρχος
* A commander of 1000 soldiers, a chiliarch, Curt. 5. 2, 2. Also in gen., a head of 1000 persons, Cod. Th. 16, 10, 20, § 4.
* Among the Persians, the highest officer of state next to the king, chancellor of state, Nep. Con. 3, 2.
Charlton T. Lewis, Charles Short, A Latin Dictionary