One day as she was carrying a fairly heavy (for her) basket of Morgana's laundry up the stairs, a well-dressed blonde boy about her age came walking the same way and just behind her.
"Can you please move?" he sighed in impatience.
Unsure now how to address this person, Gwen deferred by bowing her head.
"Of course, sir," she said, and as she made to step down so that he might pass her on the narrow staircase, her foot slipped and she stumbled. While she didn't drop the basket of clothes down the stairs (which would have meant hours more of washing for her), she twisted her ankle as she fell and landed on the stairs with a cry of pain.
The blonde boy had gotten two steps up, but turned at the sound of her distress.
As Gwen fought back tears and attempted to pull herself back up, the boy walked back down the stairs towards her, and held out his hand to her.
"Here," he said, and Gwen took the proferred hand. He pulled her up.
"I'm Arthur."
"Gwen," she said as she curtsied.
He smiled.
"Let me get you some help with that," he said, and despite her protests, he commandeered another passing servant to get the basket and Arthur put an arm around her waist, helping her to walk to Morgana's door.
When Gwen turned to thank him, the boy was gone.
It didn't occur to her until Morgana clarified it that Gwen had been rescued by Prince Arthur.