Alexander Dyce, A General Glossary to Shakespeare's Works

emulous maliciously rival or contending: “emulous factions,” TROILUS AND CRESSIDA, ii. 3. 69 ; “He is not emulous,” TROILUS AND CRESSIDA, ii. 3. 225 ; “Made emulous missions 'mongst the gods themselves, And drave great Mars to faction” TROILUS AND CRESSIDA, iii. 3. 189. ( “Mission means the descent of deities to combat on either side; an idea which Shakespeare very probably adopted from Chapman's translation of Homer. In the Fifth Book Diomed wounds Mars, who on his return to heaven is rated by Jupiter for having interfered in the battle. This disobedience is the faction which, I suppose, Ulysses would describe.” STEEVENS)