Answer:
Step-by-step explanation:
Sir Kay was treating author as servant before, the reason why he knelt before him after treating him as a servant all those years was because he later discovered who Arthur really is, as said in this part of the book “Now I know!” sputtered Sir Ector, choking back tears.
“Now I know who you are!". He discovered that even though he adopted Arthur, he has a blood of king in him.