With not so much a Crowning Moment as a Crowning Reputation of Awesome, Benedict of Amber is known as the best fighter in all the worlds. A perfect illustration is given when his brother Corwin—a man strong enough to lift cars, wrestle with demons, and snap necks with his bare hands; skilled enough to outfight dozens of men at a time, and tough enough to grow his eyes back after being blinded and survive the bubonic plague—finds out that Benedict is coming to get him. Corwin turns and runs.
Corwin himself is the second best fighter of the worlds: which should gives you an idea of Benedict's strength, considering the best warrior after him fear him that much.
Corwin, in chains at his brother's coronation, gets his hands on the crown and promptly dubs himself King of Amber.