Final answer:
The word 'advanced' in the context given suggests a tone of respect as the subject approaches the king with purpose and confidence.
Step-by-step explanation:
In the sentence "Brave in his helmet, he advanced till he stood before the king," the author most likely uses the word "advanced" to create a tone of respect. The phrase suggests a sense of purpose and confidence as the subject approaches the king. The action of advancing, especially in the context of military or courageous situations drawn from the provided text references, implies progression with confidence and without fear, aggression, or timidity.