User blog comment:Fimber/Background stories that have been ignored?.../@comment-3325613-20120902171057/@comment-5102537-20120903120048

Yes, if it was only about foreseeing the future with the capability to change the outcome, all would be open and Merlin would be in danger just as much as everyone else. The point is that what happened in the first three seasons was not only foreseen but actually inevitable.

All the prophecies have come true so far, Merlin couldn't change the future in "The Crystal Cave", he couldn't sacrifice himself to close the veil and even the Cailleach couldn't kill him, the Vilia told Lancelot that Merlin's future has been written since the dawn of time, hence he couldn't die and was healed - Freya gave Merlin Excalibur because she was killed and now the Lady of the lake which saved Camelot - Excalibur was forged only because Merlin would need it later - The Great Purge was started and Arthur was born to have Merlin have a destiny and come to Camelot - The Fisher King had awaited Merlin's arrival for centuries and only met him because Merlin went on the quest due to Morgana's bracelet for Arthur which she had only given him because she hated Uther which she only did because Uther had banned magic which he only did because Igraine died when giving birth to Arthur which only happened to have Merlin fulfill his destiny which only happens because his future has been written since the dawn of time (which means since EVERHING in this universe has begun).

Even Morgana couldn't change what she had seen in her visions, no matter what. On Merlin, it's impossible to change the future, therefore it's impossible for Merlin to die until he has finished for what he came into existence.

I too think that Uther knew about Morgana's magic when he was her prisoner at the latest. But logic demands that he actually had known about her magic all along. Well, not that logic would play a big part on the show...