Meaning
The "captain of the guard" mentioned in Acts 28:16 was the Praetorian prefect, the commander of the Praetorian troops.
(2.) Another word (Heb. katsin) so translated denotes sometimes a military (Josh 10:24; Judg 11:6, 11; Isa 22:3 "rulers;" Dan 11:18) and sometimes a civil command, a judge, magistrate, Arab. kady , (Isa 1:10; 3:6; Micah 3:1, 9).
(3.) It is also the rendering of a Hebrew word (shalish) meaning "a third man," or "one of three." The LXX. render in plural by tristatai; i.e., "soldiers fighting from chariots," so called because each war-chariot contained three men, one of whom acted as charioteer while the other two fought (Ex 14:7; 15:4; 1Kings 9:22; comp. 2Kings 9:25). This word is used also to denote the king's body-guard (2Kings 10:25; 1Chr 12:18; 2Chr 11:11) or aides-de-camp.
(4.) The "captain of the temple" mentioned in Acts 4:1 and 5:24 was not a military officer, but superintendent of the guard of priests and Levites who kept watch in the temple by night. (Comp. "the ruler of the house of God," 1Chr 9:11; 2Chr 31:13; Neh 11:11.)
(5.) The Captain of our salvation is a name given to our Lord (Heb 2:10), because he is the author and source of our salvation, the head of his people, whom he is conducting to glory. The "captain of the Lord's host" (Josh 5:14, 15) is the name given to that mysterious person who manifested himself to Abraham (Gen 12:7), and to Moses in the bush (Ex 3:2, 6, etc.) the Angel of the covenant. (See ANGEL)