adversary

one that opposes to, or relating to, enemy

syn:  antagonist, opponent         

ant:  friend, ally

Antigone was an adversary of King Creon.

allegiance

the obligation of a feudal vassel to his lord

syn:  loyalty     

ant:  treason

I feel a strong allegiance to the U.S.A.

warrior/fighter;

one who does battle for another's rights or honor

syn:  defender

ant:  loser

He is a champion of the First Amendment.

chivalry

the sum of ideal qualifications

(code of action) of a knight

syn:  gallantry, courtesy

ant:  rudeness, cowardly

Chivalry was very important if you wanted to be a knight.

an attendant at court

syn:  flatterer

ant:  hater

My friend was elected as a courtier for the homecoming court.

loyalty;

observe vows of service and duty

syn:  faithfulness

ant:  disloyal, cheat

His fidelty to the king was well known to all.

illicit lover

syn: doxy, concubine

ant: spouse, mate

Once she found out he had a paramour, she broke up with him.

exceptional or superior ability

syn: aptitude, mastery

ant: inability, weakness

Sir Lancelot proved his prowess as a knight.

paid back;

something returned

syn: atonement

ant: take

He offered recompense after seeing the destruction the fight caused.

sporting competition

syn: contest

ant: forfeit

He was the top player during the tournament.