Henry George Liddell, Robert Scott, A Greek-English Lexicon

A.tetrarch, Str.12.5.1, Plu.Ant.56, OGI416 (Cos, i. A.D.), 543.3 (Ancyra, ii A.D.), etc.; of rulers under the protection of Rome of lower grade than kings, e.g. in Palestine, Ev.Matt.14.1, al., J.BJ1.12.5, al.; generally, Sall.Cat.20.7, Hor.Sat.1.3.12, etc.: also τέτραρχος , “Θεσσαλῶν” SIG274 (Delph., iv B.C.): gen. “-χου” OGI606.4 (Syria, i A.D.), but “-χα” IGRom.4.1683 (Pergam.): cf. τετραρχία.

II. a leader of four λόχοι, or 64 men, Rev.Arch.3 (1934).40 (Amphipolis, iii/ii B.C.), 6(1935).31 (ibid., ii B.C.), Ascl.Tact.2.8, Arr.Tact.10.1, Ael.Tact.9.2.