dux (general term): auctor, princeps (that lakes the lead in anything): qui praeest alicui rei (a president): dux belli, imperator, praetor (a leader in war): praetor (of generals who were not Romans, especially of Greeks; e.g., στρατηγός); doctor, magister, auctor (alicujus rei, instructor, teacher): caput, signifer, fax (head of a party, leader of a conspiracy, etc.): the leader in a civil war (who gave the signal for rising), tuba belli civilis (Cic., ad Div., 6, 12, 3).