Posted 30 December 2011 - 07:08 AM
Hello. I'm new. First post!
So, I wondered if, in addition to all the reasons stated above, that Benjen, like Eddard, had a guilty secret. For this to ring true with you, you'd need to be on board with R + L = J and that Rhaegar and Lyanna eloped, in love.
We know that Lyanna had doubts about her match with Robert, and she shared these with her elder brother Ned, though Ned was Robert's best friend. But I can imagine her being reluctant to open up to Ned that she was in love with someone else - Rhaegar - knowing full well the scandal that would create (Rhaegar already being married and a father). Also, recalling that Ned had spent part of his youth fostered as a ward of Jon Arryn, so the closeness that might have been there between Ned and Lyanna when they were younger would perhaps have faded.
However, perhaps the younger brother stumbled on Lyanna's secret? Perhaps he saw the lovers together at Winterfell? Perhaps Lyanna swore him to secrecy. Later, when Lyanna eloped with Rhaegar, Brandon ran off after her, then Rickard and war erupted, all events traceable to this secret liaison, Benjen would have been racked with guilt. He may have even guessed, when Ned returned from the war with a bastard child, that this was Lyanna's lovechild, not Ned's. He may have opened up to Ned, or decided to keep his secret, but as a form of self-punishment, he took the black.
Does it say anywhere how old Benjen was when the war started? Is he the youngest child, or the brother just above Lyanna in age?
I seem to remember a song/story told within the text that foreshadows this - that someone knew Lyanna's secret love - but I can't remember which book/chapter it was in, or even if I imagined it!
But there, my theory is that Benjen joined the NW as penance for his own guilt and secrets about Lyanna and Rhaegar.