The Greek term χιλίαρχος is said to be used to translate the Roman tribunus militum (following Polybius), and also for the phrase tribuni militares consulari potestate (Plutarch).
The "barracks" referenced in the book of Acts (21.34, 37; 22.24; 23.10, 16, 32), in connection to Claudius Lysias and his cohort are references to the Tower of Antonia, which Herod the Great rebuilt from a previous structure and named it after Marc Antony.
[5] For this reason, the Roman Tribune could hear the commotion caused by the confusing riot over Paul's presence in the Temple, and respond with speed (Acts 21.27-32).
The military tribune Claudius Lysias enters the New Testament narrative when he protects Paul of Tarsus from a hostile Jewish mob on the outside of the Temple grounds in Jerusalem (Acts 21.30-32).
Paul, as a controversial Greek-speaking Hebrew, evidently met some of the criteria for Lysias to conclude he was a Jewish revolutionist.
Consequently, it appears that Lysias suspects him of being "the Egyptian" who "stirred up a revolt and led the four thousand men of the Assassins [σικαρίων] out into the wilderness" (Acts 21:38).
[6] Paul was able to persuade Lysias that he was not an agitator, and provides him with his provincial citizenship as being from Tarsus, in the province of Cilicia (Acts 21.39).
Claudius desires to arrive at the truth concerning the Jewish case against Paul, and commands the Sanhedrin to assemble.
Upon learning of a plot to kill Paul, Claudius Lysias summoned two of his army officers and commanded them to get ready 200 soldiers, 70 horsemen, and 200 spearmen to leave for Caesarea Maritima.
The Center for the Study of New Testament Manuscripts houses digital photographs of Bezae NT 1588 which displays the purported text of Claudius Lysias' letter to Felix.
Part of Claudius' investigation procedure to find out more information was to stretch out the detained for whips and flog them.
Also, many times through these services, one gained an audience with the Emperor through expensive gifts to members of the inner Imperial court.