foremost

distinguished, eminent, illustrious, noble, notable, noteworthy, outstanding, prestigious, signal, star, stellar, superior

high-level, senior, top

important, influential, major, mighty, momentous, significant

incomparable, matchless, unequaled (or unequalled), unparalleled, unsurpassed

celebrated, famed, famous, renowned

high-level, senior

controlling, directing, managing, officiating, overseeing, regnant, reigning, ruling, supervisory

main, major, paramount, predominant, predominate, sovereign (also sovran)

ascendant (also ascendent), dominant, grand, superior, topmost, upmost, upper, uppermost

ancient, early, primal, primary, prime, primeval, primitive, primordial

antecedent, preceding, previous