Paladin (noun)

A heroic champion or defender, especially a knight in the service of a medieval ruler or a leader of a cause.

Origin:

Middle english, from old french, from latin palatinus, from palatium palace (of the roman emperors), from palatium, a hill in rome.

Examples:

1. The knight was considered a paladin of the king.
2. The paladin defended the kingdom from invaders.
3. The paladin's bravery was legendary.
4. The paladin was a symbol of chivalry and honor.
5. The paladin was a protector of the innocent.