"You're Required In The King's Presence, Sire"

As Uther calls Arthur to speak with him privately, Arthur isn't sure what predicament had occurred between him and his father. Until he gets handed a crinkled letter. The kingdom of Aeyland had just collapsed at the hands of Morgana. The letter explains that several knights are on a quest to find their King and Queen.
As Arthur embarks on this journey with several knights from both his kingdom and the fallen, Arthur realizes something extraordinary. The kingdom has a lost prince. And he's hiding somewhere closer than Arthur suspects.

[Completed]
(I don't own BBC Merlin)