στρατοπεδάρχηςstratopedárchēs
a ruler of an army, i.e. (specially), a Prætorian præfect
Greek (New Testament) · G4759
Meanings
a. the commander of a camp and army, a military tribune: Dion. Hal. 10, 36; Lcian. hist. conscr. 22; [Joseph. b. j. 2, 19, 4]. b. Praetorian prefect, commander of the praetorian cohorts, i. e. captain of the Roman emperor's body-guard: Acts xxviii. 16 [L T Tr WH om. the cl., see Abbot in B. D., Am. ed., s. v. Captain of the Guard]. There were two praetorian prefects, to whose custody prisoners sent bound to the emperor were consigned: Joseph. antt. 18, 6, 6; Plin. epp. 10, 65 (57). [See B. D. Am. ed. u. s.; Bp. Lghtft. on Phil. p. 7 sq.]*
Same root
Source: J. H. Thayer, Greek-English Lexicon of the New Testament (1889), public domain.