Answer: successful in battle
Step-by-step explanation:
Based on the passage, we can infer that the disinherited knight can be described as a chivalric hero due to the fact that he was successful in battle.
The chivalric hero is a hero who sets out in order to find an adventure. He was successful in battles. Other options given are incorrect as they don't define what a chivalric hero is about.
Bring envied, engaging in trickery, and the flaunting of ones power cannot be considered to be chivalric.